Synchronizing zconf.h to latest zlib

It fix issues with Windows compilation This reverts commit 9db55fc27131048d1e7aba9ac4fb0f1bd878d1c7.

Synchronizing zconf.h to latest zlib
4f189853 · Oksana Shadura · Philippe Canal · cb64072c · 4f189853
Commit 4f189853 authored 6 years ago by Oksana Shadura Committed by Philippe Canal 6 years ago
--- a/builtins/zlib/zconf.h
+++ b/builtins/zlib/zconf.h
@@ -408,11 +408,11 @@ typedef uLong FAR uLongf;
   typedef unsigned long z_crc_t;
 #endif

-#if 1    /* was set to #if 1 by ./configure */
+#if HAVE_UNISTD_H    /* was set to #if 1 by ./configure */
 #  define Z_HAVE_UNISTD_H
 #endif

-#if 1    /* was set to #if 1 by ./configure */
+#if HAVE_STDARG_H    /* was set to #if 1 by ./configure */
 #  define Z_HAVE_STDARG_H
 #endif