Makefile: move ZLIB flags outside of GME check

src/Makefile

@@ -318,9 +318,6 @@ LIBS+=$(PNG_LDFLAGS)
 CFLAGS+=$(PNG_CFLAGS)
 endif
 
-ifdef HAVE_LIBGME
-OPTS+=-DHAVE_LIBGME
-
 ZLIB_PKGCONFIG?=zlib
 ZLIB_CFLAGS?=$(shell $(PKG_CONFIG) $(ZLIB_PKGCONFIG) --cflags)
 ZLIB_LDFLAGS?=$(shell $(PKG_CONFIG) $(ZLIB_PKGCONFIG) --libs)
@@ -328,6 +325,9 @@ ZLIB_LDFLAGS?=$(shell $(PKG_CONFIG) $(ZLIB_PKGCONFIG) --libs)
 LIBS+=$(ZLIB_LDFLAGS)
 CFLAGS+=$(ZLIB_CFLAGS)
 
+ifdef HAVE_LIBGME
+OPTS+=-DHAVE_LIBGME
+
 LIBGME_PKGCONFIG?=libgme
 LIBGME_CFLAGS?=$(shell $(PKG_CONFIG) $(LIBGME_PKGCONFIG) --cflags)
 LIBGME_LDFLAGS?=$(shell $(PKG_CONFIG) $(LIBGME_PKGCONFIG) --libs)