configure: check for build dir when building version res (fix bug #4858)

Fixes a race where we try to build version res file in build directory
before it has even been created. Prevents errors like:

/bin/bash ../SDL2-2.0.10/build-scripts/updaterev.sh
/bin/bash ../SDL2-2.0.10/build-scripts/mkinstalldirs build
mkdir -p -- build
x86_64-pokysdk-mingw32-windres --include-dir=/home/pokybuild/yocto-worker/meta-mingw/build/build/tmp/work/x86_64-nativesdk-mingw32-pokysdk-mingw32/nativesdk-libsdl2/2.0.10-r0/recipe-sysroot/opt/poky/3.0/sysroots/x86_64-pokysdk-mingw32/usr/include ../SDL2-2.0.10/src/main/windows/version.rc build/version.o
x86_64-pokysdk-mingw32-windres: build/version.o: No such file or directory
Makefile:692: recipe for target 'build/version.o' failed
make: *** [build/version.o] Error 1
make: *** Waiting for unfinished jobs....
touch build/.created
WARNING: exit code 1 from a shell command.

Extension of fix:
https://hg.libsdl.org/SDL/rev/bb65ba8e039b

Signed-off-by: Anuj Mittal <am.devel@gmail.com>
---
 configure.ac | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

configure

@@ -25493,7 +25493,7 @@ VERSION_OBJECTS=`echo $VERSION_SOURCES`
 VERSION_DEPENDS=`echo $VERSION_SOURCES`
 VERSION_OBJECTS=`echo "$VERSION_OBJECTS" | sed 's,[^ ]*/\([^ ]*\)\.rc,$(objects)/\1.o,g'`
 VERSION_DEPENDS=`echo "$VERSION_DEPENDS" | sed "s,\\([^ ]*\\)/\\([^ ]*\\)\\.rc,\\\\
-\\$(objects)/\\2.o: \\1/\\2.rc\\\\
+\\$(objects)/\\2.o: \\1/\\2.rc \\$(objects)/.created\\\\
 	\\$(WINDRES) \\$< \\$@,g"`
 
 SDLMAIN_OBJECTS=`echo $SDLMAIN_SOURCES`

configure.ac

@@ -4177,7 +4177,7 @@ VERSION_OBJECTS=`echo $VERSION_SOURCES`
 VERSION_DEPENDS=`echo $VERSION_SOURCES`
 VERSION_OBJECTS=`echo "$VERSION_OBJECTS" | sed 's,[[^ ]]*/\([[^ ]]*\)\.rc,$(objects)/\1.o,g'`
 VERSION_DEPENDS=`echo "$VERSION_DEPENDS" | sed "s,\\([[^ ]]*\\)/\\([[^ ]]*\\)\\.rc,\\\\
-\\$(objects)/\\2.o: \\1/\\2.rc\\\\
+\\$(objects)/\\2.o: \\1/\\2.rc \\$(objects)/.created\\\\
 	\\$(WINDRES) \\$< \\$@,g"`
 
 SDLMAIN_OBJECTS=`echo $SDLMAIN_SOURCES`