make: automatically include dependencies in recursive subdir rules (v2)

I think I understand enough of what's going on in these rules to ensure this is
right.  But I could certainly use a second or third opinion...

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/Makefile b/Makefile
index 74f5c5fbc5..93fb7956b0 100644
--- a/Makefile
+++ b/Makefile
@@ -406,5 +406,5 @@ tar:
 Makefile: $(GENERATED_HEADERS)
 
 # Include automatically generated dependency files
--include $(wildcard *.d audio/*.d slirp/*.d block/*.d net/*.d ui/*.d qapi/*.d)
--include $(wildcard qga/*.d hw/*.d hw/usb/*.d)
+# All subdir dependencies come automatically from our recursive subdir rules
+-include $(wildcard *.d)