Adding zlib 1.3.1

Author: Srikanth Kotagiri

build-ffmpeg

@@ -385,7 +385,7 @@ if build "nasm" "2.16.01"; then
   build_done "nasm" $CURRENT_PACKAGE_VERSION
 fi
 
-if build "zlib" "1.3"; then
+if build "zlib" "1.3.1"; then
   download "https://www.zlib.net/zlib-${CURRENT_PACKAGE_VERSION}.tar.gz"
   if $SHARED_LIBRARIES; then
     execute ./configure --shared --prefix="${WORKSPACE}"