Contribs: update zlib to 1.2.7

contrib/src/zlib/SHA512SUMS

-f812ab3049fc2920a8da4649f6e60340ac365d58a0e76ace5219426aeb0759c0a474cfb2b9902cd0471158fa32a4d2c35692309d266e66013444bdced8ed00d9  zlib-1.2.6.tar.gz
+b1c073ad26684e354f7c522c14655840592e03872bc0a94690f89cae2ff88f146fce1dad252ff27a889dac4a32ff9f8ab63ba940671f9da89e9ba3e19f1bf58d  zlib-1.2.7.tar.gz

contrib/src/zlib/rules.mak

 # ZLIB
-ZLIB_VERSION := 1.2.6
+ZLIB_VERSION := 1.2.7
 ZLIB_URL := $(SF)/libpng/zlib-$(ZLIB_VERSION).tar.gz
 
 PKGS += zlib
@@ -15,7 +15,6 @@ $(TARBALLS)/zlib-$(ZLIB_VERSION).tar.gz:
 zlib: zlib-$(ZLIB_VERSION).tar.gz .sum-zlib
 	$(UNPACK)
 	$(APPLY) $(SRC)/zlib/zlib-wince.patch
-	$(APPLY) $(SRC)/zlib/zlib-osx.patch
 	$(MOVE)
 
 .zlib: zlib

contrib/src/zlib/zlib-osx.patch

-diff -ru zlib.orig/configure zlib/configure
---- zlib.orig/configure	2012-04-30 23:41:03.155668067 -0400
-+++ zlib/configure	2012-04-30 23:41:13.787667975 -0400
-@@ -206,7 +206,7 @@
-              SHAREDLIBV=libz.$VER$shared_ext
-              SHAREDLIBM=libz.$VER1$shared_ext
-              LDSHARED=${LDSHARED-"$cc -dynamiclib -install_name $libdir/$SHAREDLIBM -compatibility_version $VER1 -current_version $VER3"}
--             AR="libtool"
-+             AR="/usr/bin/libtool"
-              ARFLAGS="-o" ;;
-   *)             LDSHARED=${LDSHARED-"$cc -shared"} ;;
-   esac