- Tested and updated MSVC project file to really make it work with new zlib

- Removed unnecessary zconf.in.h
- Fixed include dirs for several MSVC targets

code/zlib/zconf.h

@@ -284,7 +284,7 @@ typedef uLong FAR uLongf;
    typedef Byte       *voidp;
 #endif
 
-#if 1           /* HAVE_UNISTD_H -- this line is updated by ./configure */
+#ifndef _MSC_VER           /* HAVE_UNISTD_H -- this line is updated by ./configure */
 #  include <sys/types.h> /* for off_t */
 #  include <unistd.h>    /* for SEEK_* and off_t */
 #  ifdef VMS