build: Temporary patch to make Windows compile

--- a/Makefile.mingw
+++ b/Makefile.mingw
@@ -9,10 +9,12 @@
 #
 SRCDIR = src
 INCDIR = include
+BUILD = build
 
 CC ?= gcc
 SETUP_COMPILER_FLAG?=
 DLLWRAP = dllwrap
+MKDIR = mkdir -p
 WINDRES = windres
 SH = /bin/sh
 ZIP = zip
@@ -26,24 +28,25 @@ CFLAGS ?= -Os
 CFLAGS += -Wall
 CFLAGS += -W -Wstrict-prototypes
 
-CPPFLAGS += -DNDEBUG -D_WIN32_WINNT=0x501
+CPPFLAGS += -DNDEBUG -D_WIN32_WINNT=0x601
 CPPFLAGS += -Iinclude
 CPPFLAGS += -I.
+CPPFLAGS += -I$(BUILD)
 
 # -liphlpapi is needed for GetBestRoute() and GetIpAddrTable()
 LDLIBS = -lws2_32 -liphlpapi
 
 PYTHON=\utils\python25\python
-OBJS=miniwget.o minixml.o igd_desc_parse.o minisoap.o \
+OBJS=$(addprefix $(BUILD)/,miniwget.o minixml.o igd_desc_parse.o minisoap.o \
      minissdpc.o \
      miniupnpc.o upnpreplyparse.o upnpcommands.o upnperrors.o \
      connecthostport.o portlistingparse.o receivedata.o \
-     upnpdev.o addr_is_reserved.o
+     upnpdev.o addr_is_reserved.o)
 OBJSDLL=$(addprefix dll-, $(OBJS)) winres.o
-BINARIES=upnpc-static.exe upnpc-shared.exe \
+BINARIES=$(addprefix $(BUILD)/,upnpc-static.exe upnpc-shared.exe \
          upnp-listdevices-static.exe upnp-listdevices-shared.exe \
          miniupnpc.dll libminiupnpc.a \
-         testminixml.exe
+         testminixml.exe)
 ifneq ($(GITHUB_SHA),)
 COMMITREF=$(GITHUB_SHA)
 else
@@ -76,11 +79,12 @@ clean:
 	$(RM) miniupnpc.dll miniupnpc.lib miniupnpc.dll.def
 	$(RM) libminiupnpc.a
 	$(RM) $(DISTFILE)
+	$(RM) -r build/
 
 $(DISTFILE):	$(BINARIES)
 	$(ZIP) $@ *.exe *.dll *.lib *.def *.a LICENSE README Changelog.txt
 
-libminiupnpc.a:	$(OBJS)
+$(BUILD)/libminiupnpc.a: $(OBJS)
 	$(AR) cr $@ $?
 
 pythonmodule:	libminiupnpc.a
@@ -97,13 +101,13 @@ miniupnpc.dll:	miniupnpc.def $(OBJSDLL)
 
 miniupnpc.lib:	miniupnpc.dll
 
-%.o:	$(SRCDIR)/%.c
+$(BUILD)/%.o:	$(SRCDIR)/%.c
 	$(CC) $(CFLAGS) $(CPPFLAGS) -DMINIUPNP_STATICLIB -c -o $@ $<
 
-dll-%.o:	$(SRCDIR)/%.c
+$(BUILD)/dll-%.o:	$(SRCDIR)/%.c
 	$(CC) $(CFLAGS) $(CPPFLAGS) -DMINIUPNP_EXPORTS -c -o $@ $<
 
-%-shared.o:	$(SRCDIR)/%.c
+$(BUILD)/%-shared.o:	$(SRCDIR)/%.c
 	$(CC) $(CFLAGS) $(CPPFLAGS) -c -o $@ $<
 
 # --enable-stdcall-fixup
@@ -131,7 +135,8 @@ miniupnpcstrings.h: miniupnpcstrings.h.in wingenminiupnpcstrings.exe VERSION
 
 rc_version.h:	miniupnpcstrings.h
 else
-miniupnpcstrings.h:	miniupnpcstrings.h.in VERSION
+$(BUILD)/miniupnpcstrings.h:	miniupnpcstrings.h.in VERSION
+	@$(MKDIR) $(@D)
 	sed 's|OS_STRING ".*"|OS_STRING "Windows/Mingw32"|' $< | \
 	sed 's|MINIUPNPC_VERSION_STRING ".*"|MINIUPNPC_VERSION_STRING "$(shell cat VERSION)"|' > $@
 
@@ -143,7 +148,7 @@ rc_version.h:	VERSION
 	mv $@.tmp $@
 endif
 
-miniupnpc.pc:	VERSION
+$(BUILD)/miniupnpc.pc:	VERSION
 	$(RM) $@
 	echo "prefix=$(INSTALLPREFIX)" >> $@
 	echo "exec_prefix=\$${prefix}" >> $@
@@ -156,32 +161,32 @@ miniupnpc.pc:	VERSION
 	echo "Libs: -L\$${libdir} -lminiupnpc" >> $@
 	echo "Cflags: -I\$${includedir}" >> $@
 
-winres.o:	miniupnpc.rc rc_version.h
+$(BUILD)/winres.o:	miniupnpc.rc rc_version.h
 	$(WINDRES) -D INTERNAL_NAME=\\\"miniupnpc.dll\\0\\\" -i $< -o $@
 
 testminixml.exe:	testminixml.o minixml.o igd_desc_parse.o
 	$(CC) -static -o $@ $^
 
-minixml.o:	$(SRCDIR)/minixml.c $(SRCDIR)/minixml.h
+$(BUILD)/minixml.o:	$(SRCDIR)/minixml.c $(SRCDIR)/minixml.h
 
-upnpc.o:	include/miniwget.h $(SRCDIR)/minisoap.h include/miniupnpc.h include/igd_desc_parse.h
-upnpc.o:	include/upnpreplyparse.h include/upnpcommands.h include/upnperrors.h miniupnpcstrings.h
+$(BUILD)/upnpc.o:	include/miniwget.h $(SRCDIR)/minisoap.h include/miniupnpc.h include/igd_desc_parse.h
+$(BUILD)/upnpc.o:	include/upnpreplyparse.h include/upnpcommands.h include/upnperrors.h miniupnpcstrings.h
 
-miniwget.o:	$(SRCDIR)/miniwget.c include/miniwget.h miniupnpcstrings.h $(SRCDIR)/connecthostport.h
+$(BUILD)/miniwget.o:	$(SRCDIR)/miniwget.c include/miniwget.h $(BUILD)/miniupnpcstrings.h $(SRCDIR)/connecthostport.h
 
-minisoap.o:	$(SRCDIR)/minisoap.c $(SRCDIR)/minisoap.h miniupnpcstrings.h
+$(BUILD)/minisoap.o:	$(SRCDIR)/minisoap.c $(SRCDIR)/minisoap.h $(BUILD)/miniupnpcstrings.h
 
-miniupnpc.o:	$(SRCDIR)/miniupnpc.c include/miniupnpc.h $(SRCDIR)/minisoap.h \
+$(BUILD)/miniupnpc.o:	$(SRCDIR)/miniupnpc.c include/miniupnpc.h $(SRCDIR)/minisoap.h \
 	include/miniwget.h $(SRCDIR)/minixml.h $(SRCDIR)/addr_is_reserved.h
 
-igd_desc_parse.o:	$(SRCDIR)/igd_desc_parse.c include/igd_desc_parse.h
+$(BUILD)/igd_desc_parse.o:	$(SRCDIR)/igd_desc_parse.c include/igd_desc_parse.h
 
-upnpreplyparse.o:	$(SRCDIR)/upnpreplyparse.c include/upnpreplyparse.h $(SRCDIR)/minixml.h
+$(BUILD)/upnpreplyparse.o:	$(SRCDIR)/upnpreplyparse.c include/upnpreplyparse.h $(SRCDIR)/minixml.h
 
-upnpcommands.o:	$(SRCDIR)/upnpcommands.c include/upnpcommands.h include/upnpreplyparse.h \
+$(BUILD)/upnpcommands.o:	$(SRCDIR)/upnpcommands.c include/upnpcommands.h include/upnpreplyparse.h \
 	include/miniupnpc.h include/portlistingparse.h
 
-minissdpc.o:	$(SRCDIR)/minissdpc.c $(SRCDIR)/minissdpc.h $(SRCDIR)/receivedata.h
+$(BUILD)/minissdpc.o:	$(SRCDIR)/minissdpc.c $(SRCDIR)/minissdpc.h $(SRCDIR)/receivedata.h
 
-upnpdev.o:	$(SRCDIR)/upnpdev.c include/upnpdev.h
+$(BUILD)/upnpdev.o:	$(SRCDIR)/upnpdev.c include/upnpdev.h