In native builds, qemu can fail to find zlib development files in the native 
sysroot and the build machine might not have zlib-dev packages installed.

Add CFLAGS to qemu's CFLAGS which in the native case means BUILD_CFLAGS are
added and files in the sysroot can be found.

Patch from Paul Eggleton, Comments by RP 28/11/10

Upstream-Status: Inappropriate [embedded specific]

Index: qemu-0.14.0/configure
===================================================================
--- qemu-0.14.0.orig/configure
+++ qemu-0.14.0/configure
@@ -229,6 +229,7 @@ QEMU_CFLAGS="-Wstrict-prototypes -Wredun
 QEMU_CFLAGS="-D_GNU_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE $QEMU_CFLAGS"
 QEMU_CFLAGS="-D_FORTIFY_SOURCE=2 $QEMU_CFLAGS"
 QEMU_INCLUDES="-I. -I\$(SRC_PATH)"
+QEMU_CFLAGS="$QEMU_CFLAGS $CFLAGS"
 LDFLAGS="-g $LDFLAGS"
 
 # make source path absolute
