Merge pull request #19392 from hrydgard/warning-fixes

Warning fixes in our zlib fork

ext/zlib/gzlib.c

@@ -5,6 +5,10 @@
 
 #include "gzguts.h"
 
+#ifndef _WIN32
+#include <unistd.h>
+#endif
+
 #if defined(_WIN32) && !defined(__BORLANDC__)
 #  define LSEEK _lseeki64
 #else

ext/zlib/gzread.c

@@ -5,6 +5,10 @@
 
 #include "gzguts.h"
 
+#ifndef _WIN32
+#include <unistd.h>
+#endif
+
 /* Local functions */
 local int gz_load OF((gz_statep, unsigned char *, unsigned, unsigned *));
 local int gz_avail OF((gz_statep));

ext/zlib/gzwrite.c

@@ -5,6 +5,10 @@
 
 #include "gzguts.h"
 
+#ifndef _WIN32
+#include <unistd.h>
+#endif
+
 /* Local functions */
 local int gz_init OF((gz_statep));
 local int gz_comp OF((gz_statep, int));