configure: Replace bash code by standard shell code

"+=" does not work with dash and other simple /bin/sh implementations.

The new code prepends the flag while the old code either did not work
(it continued after an error message which typically was not read) or
appended the flag. That difference should not matter here.

Reported-by: Olaf Hering <olaf@aepfle.de>
Signed-off-by: Stefan Weil <sw@weilnetz.de>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/configure b/configure
index ec95819f6e..f74bf0f04f 100755
--- a/configure
+++ b/configure
@@ -2812,7 +2812,7 @@ int main(int argc, char **argv)
 }
 EOF
   if ! compile_prog "" "" ; then
-    CFLAGS+="-march=i486"
+    CFLAGS="-march=i486 $CFLAGS"
   fi
 fi