Add zlib headers

Makefile.common

@@ -3,7 +3,8 @@ LIBRETRO_COMM_DIR := $(CORE_DIR)/libretro/libretro-common
 INCFLAGS := -I$(CORE_DIR) \
             -I$(CORE_DIR)/atari800/src \
             -I$(CORE_DIR)/libretro  \
-            -I$(LIBRETRO_COMM_DIR)/include
+            -I$(LIBRETRO_COMM_DIR)/include \
+            -I$(LIBRETRO_COMM_DIR)/include/compat/zlib \
 
 ifeq ($(STATIC_LINKING), 1)
 INCFLAGS += -I$(CORE_DIR)/libretro/include

libretro/libretro-common/include/compat/zlib/zlib.h

@@ -1,12 +1,6 @@
 #ifndef _COMPAT_ZLIB_H
 #define _COMPAT_ZLIB_H
 
-#ifdef WANT_ZLIB
-
-#ifdef RARCH_INTERNAL
-#include "zconf.h.in"
-#endif
-
 /* zlib.h -- interface of the 'zlib' general purpose compression library
   version 1.2.8, April 28th, 2013
 
@@ -1742,9 +1736,8 @@ uint32_t adler32 (uint32_t adler, const uint8_t *buf, size_t len);
  const char   *  zError           (int);
  int             inflateSyncPoint (z_streamp);
 
- const uint32_t * get_crc_table(void);
+const uint32_t * get_crc_table(void);
  int             inflateUndermine (z_streamp, int);
- int             inflateValidate  (z_streamp, int);
  int             inflateResetKeep (z_streamp);
  int             deflateResetKeep (z_streamp);
 #if defined(_WIN32) && !defined(Z_SOLO)
@@ -1765,8 +1758,4 @@ uint32_t adler32 (uint32_t adler, const uint8_t *buf, size_t len);
 
 #endif /* ZLIB_H */
 
-#else
-#include <zlib.h>
-#endif
-
 #endif

libretro/libretro-common/include/compat/zlib/zutil.h

@@ -24,7 +24,7 @@
 #  define ZLIB_INTERNAL
 #endif
 
-#include <compat/zlib.h>
+#include <zlib.h>
 
 #if defined(STDC) && !defined(Z_SOLO)
 #  if !(defined(_WIN32_WCE) && defined(_MSC_VER))