BLD: Downgrade FreeType to 2.6.1 on Windows ARM

We needed the new version because autotools didn't know about
Windows-on-ARM. But we build with Meson now, and overlay a Meson build
system for FreeType, so it either works for both of us or it doesn't
(and it does).

Dropping down to the older version means that tests pass on Windows ARM
without any need to mess with tolerance or generating new images.

Author: QuLogic

doc/api/next_api_changes/development/27676-ES.rst

@@ -0,0 +1,6 @@
+Windows on ARM64 support
+~~~~~~~~~~~~~~~~~~~~~~~~
+
+Windows on ARM64 bundles FreeType 2.6.1 instead of 2.11.1 when building from source.
+This may cause small changes to text rendering, but should become consistent with all
+other platforms.

extern/meson.build

@@ -14,14 +14,7 @@ else
   # must match the value in `lib/matplotlib.__init__.py`. Also update the docs
   # in `docs/devel/dependencies.rst`. Bump the cache key in
   # `.circleci/config.yml` when changing requirements.
-  TESTING_VERSION_OF_FREETYPE = '2.6.1'
-  if host_machine.system() == 'windows' and host_machine.cpu_family() == 'aarch64'
-    # Older versions of freetype are not supported for win/arm64
-    # Matplotlib tests will not pass
-    LOCAL_FREETYPE_VERSION = '2.11.1'
-  else
-    LOCAL_FREETYPE_VERSION = TESTING_VERSION_OF_FREETYPE
-  endif
+  LOCAL_FREETYPE_VERSION = '2.6.1'
 
   freetype_proj = subproject(
     f'freetype-@LOCAL_FREETYPE_VERSION@',