fix build on macos and clang when zip.h is present on system from zlib library

src/decode.c

@@ -807,7 +807,7 @@ PyImaging_XbmDecoderNew(PyObject* self, PyObject* args)
 
 #ifdef HAVE_LIBZ
 
-#include "Zip.h"
+#include "ZipState.h"
 
 PyObject*
 PyImaging_ZipDecoderNew(PyObject* self, PyObject* args)

src/encode.c

@@ -578,7 +578,7 @@ PyImaging_XbmEncoderNew(PyObject* self, PyObject* args)
 
 #ifdef HAVE_LIBZ
 
-#include "Zip.h"
+#include "ZipState.h"
 
 PyObject*
 PyImaging_ZipEncoderNew(PyObject* self, PyObject* args)

src/libImaging/ZipDecode.c

@@ -20,7 +20,7 @@
 
 #ifdef  HAVE_LIBZ
 
-#include "Zip.h"
+#include "ZipState.h"
 
 static const int OFFSET[] = { 7, 3, 3, 1, 1, 0, 0 };
 static const int STARTING_COL[] = { 0, 4, 0, 2, 0, 1, 0 };

src/libImaging/ZipEncode.c

@@ -19,7 +19,7 @@
 
 #ifdef  HAVE_LIBZ
 
-#include "Zip.h"
+#include "ZipState.h"
 
 int
 ImagingZipEncode(Imaging im, ImagingCodecState state, UINT8* buf, int bytes)