fixup! mingw: Compile the Git wrapper

Author: dscho

config.mak.uname

@@ -579,7 +579,7 @@ else
 git-wrapper$(X): compat/win32/git-wrapper.o git.res
 	$(QUIET_LINK)$(CC) -Wall -s -o $@ $^ -lshell32 -lshlwapi
 
-compat/win32/git-wrapper.o: %.o: %.c
+compat/win32/git-wrapper.o: %.o: %.c GIT-PREFIX
 	$(QUIET_CC)$(CC) -o $*.o -c -Wall -Wwrite-strings $<
 
 endif