Support building free-threaded CPython (#319)

* Support building free-threaded CPython

Add support for Python's free threading build mode where the global
interpreter lock is disabled. The packages are marked using a suffix on
the architecture, like 'x64-freethreaded' or 'arm64-freethreaded'.

* Match '-freethreaded' in arch

* Use type 'string' instead of 'str'

* On Linux, only delete Python installations with the same architecture.

This matches the macOS behavior and allows users to install both the
free-threading and default builds at the same time.

tests/sources/python-config-test.py

@@ -60,15 +60,15 @@ else:
 if os_type == 'Darwin':
     ### Validate openssl links
     if version_major == 3 and version_minor < 7:
-        expected_ldflags = '-L/usr/local/opt/openssl@1.1/lib'
+        expected_ldflags = '-L/usr/local/opt/openssl@3/lib'
         ldflags = sysconfig.get_config_var('LDFLAGS')
 
         if not expected_ldflags in ldflags:
             print('Invalid ldflags: %s; Expected: %s' % (ldflags, expected_ldflags))
             exit(1)
     else:
-        expected_openssl_includes = '-I/usr/local/opt/openssl@1.1/include'
-        expected_openssl_ldflags ='-L/usr/local/opt/openssl@1.1/lib'
+        expected_openssl_includes = '-I/usr/local/opt/openssl@3/include'
+        expected_openssl_ldflags ='-L/usr/local/opt/openssl@3/lib'
 
         openssl_includes = sysconfig.get_config_var('OPENSSL_INCLUDES')
         openssl_ldflags = sysconfig.get_config_var('OPENSSL_LDFLAGS')