fixup! mingw: Compile the Git wrapper

This ensures that the Git wrapper is compiled with Adress Space Layout
Randomization (ASLR) and Data Execution Prevention (DEP). The Git
wrapper is still compiled without the stack protector, because that
would require the executables to be linked against libssp, something we
definitely do not want for e.g.  git-bash.exe).

Since the Git wrapper also serves as /bin/git redirector (to keep legacy
callers working that expect git.exe to live in the top-level /bin/
directory), this fixes #644
partially (which pointed out that /bin/git.exe is compiled without
ASLR/DEP).

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

config.mak.uname

@@ -579,10 +579,12 @@ else
 	BUILT_IN_WRAPPER = git-wrapper$(X)
 
 git-wrapper$(X): compat/win32/git-wrapper.o git.res
-	$(QUIET_LINK)$(CC) -Wall -s -o $@ $^ -lshell32 -lshlwapi
+	$(QUIET_LINK)$(CC) $(ALL_LDFLAGS) $(COMPAT_CFLAGS) \
+		-fno-stack-protector -Wall -s -o $@ $^ -lshell32 -lshlwapi
 
 compat/win32/git-wrapper.o: %.o: %.c GIT-PREFIX
-	$(QUIET_CC)$(CC) -o $*.o -c -Wall -Wwrite-strings $<
+	$(QUIET_CC)$(CC) $(ALL_CFLAGS) $(COMPAT_CFLAGS) \
+		-fno-stack-protector -o $*.o -c -Wall -Wwrite-strings $<
 
 endif
 endif