Updated zlib used for win32 builds.
diff --git a/misc/GNUmakefile b/misc/GNUmakefile
index 0689877..69ef229 100644
--- a/misc/GNUmakefile
+++ b/misc/GNUmakefile
@@ -7,7 +7,7 @@
 
 OBJS =		objs.msvc8
 OPENSSL =	openssl-1.0.1c
-ZLIB =		zlib-1.2.5
+ZLIB =		zlib-1.2.7
 PCRE =		pcre-8.31