Commit 0dcef97 for zlib

commit 0dcef97505ccf205b05e202211567030d517d691
Author: Orgad Shaneh <orgad.shaneh@audiocodes.com>
Date:   Fri Mar 20 08:00:49 2020 +0200

    Fix win32/Makefile.gcc to work with mingw32-make -r.

diff --git a/win32/Makefile.gcc b/win32/Makefile.gcc
index 35172fb..f41add3 100644
--- a/win32/Makefile.gcc
+++ b/win32/Makefile.gcc
@@ -76,10 +76,10 @@ testdll: example_d.exe minigzip_d.exe
 	./example_d
 	echo hello world | ./minigzip_d | ./minigzip_d -d

-.c.o:
+%.o: %.c
 	$(CC) $(CFLAGS) -c -o $@ $<

-.S.o:
+%.o: %.S
 	$(AS) $(ASFLAGS) -c -o $@ $<

 $(STATICLIB): $(OBJS) $(OBJA)