use minizip from system zlib

https://bugs.gentoo.org/383845

--- a/Makefile
+++ b/Makefile
@@ -101,8 +101,6 @@
 	main/plugin.o \
 	main/rom.o \
 	main/savestates.o \
-	main/zip/ioapi.o \
-	main/zip/unzip.o \
 	main/7zip/7zAlloc.o \
 	main/7zip/7zBuffer.o \
 	main/7zip/7zCrc.o \
@@ -229,7 +227,7 @@
 # set primary objects and libraries for all outputs
 ALL = mupen64plus $(PLUGINS)
 OBJECTS = $(OBJ_CORE) $(OBJ_DYNAREC) $(OBJ_OPENGL)
-LIBS = $(SDL_LIBS) $(LIBGL_LIBS) $(LZMA_LIBS) -lbz2
+LIBS = $(SDL_LIBS) $(LIBGL_LIBS) $(LZMA_LIBS) -lbz2 -lminizip
 STATIC_LIBS =
 CFLAGS+= $(LZMA_FLAGS)
 
--- a/main/rom.c
+++ b/main/rom.c
@@ -27,7 +27,7 @@
 #include <limits.h>
 #include <zlib.h>
 
-#include "zip/unzip.h"
+#include "minizip/unzip.h"
 #include <bzlib.h>
 #include <lzma.h>
 #include "7zip/7zExtract.h"