Revert "Revert to zlib on macOS < 10.15"

This reverts commit 6c7917d7a6.

.github/workflows/wheels-dependencies.sh

@@ -101,7 +101,6 @@ OPENJPEG_VERSION=2.5.3
 XZ_VERSION=5.8.1
 TIFF_VERSION=4.7.0
 LCMS2_VERSION=2.17
-ZLIB_VERSION=1.3.1
 ZLIB_NG_VERSION=2.2.5
 LIBWEBP_VERSION=1.6.0
 BZIP2_VERSION=1.0.8
@@ -259,11 +258,7 @@ function build {
     if [ -z "$IS_ALPINE" ] && [ -z "$SANITIZER" ] && [ -z "$IS_MACOS" ]; then
         yum remove -y zlib-devel
     fi
-    if [[ -n "$IS_MACOS" ]] && [[ "$MACOSX_DEPLOYMENT_TARGET" == "10.10" || "$MACOSX_DEPLOYMENT_TARGET" == "10.13" ]]; then
-        build_new_zlib
-    else
-        build_zlib_ng
-    fi
+    build_zlib_ng
 
     build_simple xcb-proto 1.17.0 https://xorg.freedesktop.org/archive/individual/proto
     if [[ -n "$IS_MACOS" ]]; then

checks/check_wheel.py

@@ -4,7 +4,6 @@ import platform
 import sys
 
 from PIL import features
-from Tests.helper import is_pypy
 
 
 def test_wheel_modules() -> None:
@@ -48,8 +47,6 @@ def test_wheel_features() -> None:
 
     if sys.platform == "win32":
         expected_features.remove("xcb")
-    elif sys.platform == "darwin" and not is_pypy() and platform.processor() != "arm":
-        expected_features.remove("zlib_ng")
     elif sys.platform == "ios":
         # Can't distribute raqm due to licensing, and there's no system version;
         # fribidi and harfbuzz won't be available if raqm isn't available.