contrib: Define HAVE_MACOSX when distro=macosx*

(We don't want HAVE_MACOSX when building for iOS simulator.)

extras/contrib/bootstrap

@@ -212,7 +212,6 @@ case $TARGET in
     powerpc-apple-darwin9)
         hint_distro macosx32
         HAVE_DARWIN_32=1
-        add_enabled_makefile_cfg "HAVE_MACOSX"
 
         CFLAGS_TUNING=" -arch ppc -mtune=G4"
         EXTRA_LDFLAGS=" -arch ppc"
@@ -223,7 +222,6 @@ case $TARGET in
     i686-apple-darwin*)
         hint_distro macosx32
         HAVE_DARWIN_32=1
-        add_enabled_makefile_cfg "HAVE_MACOSX"
 
         CFLAGS_TUNING=" -march=prescott -mtune=generic -arch i386 -m32"
         EXTRA_LDFLAGS=" -arch i386"
@@ -231,7 +229,6 @@ case $TARGET in
     x86_64-apple-darwin*)
         hint_distro macosx64
         HAVE_DARWIN_64=1
-        add_enabled_makefile_cfg "HAVE_MACOSX"
 
         CFLAGS_TUNING=" -march=core2 -mtune=core2 -m64 -arch x86_64"
         EXTRA_LDFLAGS=" -arch x86_64"
@@ -341,6 +338,7 @@ case "$DISTRO" in
     add_makefile_cfg "SDK_TARGET = ${SDK_TARGET}"
     add_makefile_cfg "ENVP = MACOSX_DEPLOYMENT_TARGET=${SDK_TARGET}"
     add_makefile_cfg "MACOSX_SDK = /Developer/SDKs/MacOSX${SDK_TARGET}.sdk"
+    add_enabled_makefile_cfg "HAVE_MACOSX"
 
     case $TARGET in
     x86_64*|i686*) add_enabled_makefile_cfg "HAVE_MACOSX_ON_INTEL" ;;