build for macos 10.8 to avoid another warning

README.md

@@ -18,7 +18,7 @@ SPDX-License-Identifier: CC-BY-SA-4.0
 - Standalone `curl` tool and `libcurl` DLL. Static libraries included.
 - Required: Windows Vista and
  [Universal CRT](https://devblogs.microsoft.com/cppblog/introducing-the-universal-crt/),
- macOS High Sierra 64-bit or Apple Silicon,
+ macOS 10.8 Mountain Lion 64-bit or Apple Silicon,
  any Linux arm64 with the [MUSL](https://en.wikipedia.org/wiki/Musl) builds.
 - [HTTP/3](https://en.wikipedia.org/wiki/HTTP/3),
  [HTTP/2](https://en.wikipedia.org/wiki/HTTP/2) support,

_build.sh

@@ -754,11 +754,11 @@ build_single_target() {
  if [ "${_HOSTOS}" != "${_OS}" ]; then
  _CMAKE_GLOBAL="-DCMAKE_SYSTEM_NAME=Darwin ${_CMAKE_GLOBAL}"
  fi
- # macOS 10.9 Mavericks 2013-10-22. Seems to work for arm64 builds,
+ # macOS 10.8 Mountain Lion 2012-07-25. Seems to work for arm64 builds,
  # though arm64 was released in macOS 11.0 Big Sur 2020-11-12.
  # Bump to macOS 10.13 High Sierra 2017-09-25 if we decide to disable
  # LDAP/LDAPS for macOS builds.
- macminver='10.9'
+ macminver='10.8'
  _CMAKE_GLOBAL="${_CMAKE_GLOBAL} -DCMAKE_OSX_DEPLOYMENT_TARGET=${macminver}"
  _CFLAGS_GLOBAL="${_CFLAGS_GLOBAL} -mmacosx-version-min=${macminver}"
  _CXXFLAGS_GLOBAL="${_CXXFLAGS_GLOBAL} -mmacosx-version-min=${macminver}"