Add workaround for Fedora's rpm_prefix distribution patch (#510)

Similar to what Debian did when Ubuntu Jammy shipped, Fedora has patched
CPython to override the installation directory for Python packages,
presumably to avoid collision with the system-packaged Python modules.

Fedora's approach is slightly different, but can be patched around in a
similar way.

colcon_core/python_install_path.py

@@ -23,5 +23,11 @@ def get_python_install_path(name, vars_=()):
     if 'deb_system' in sysconfig.get_scheme_names() or \
             'osx_framework_library' in sysconfig.get_scheme_names():
         kwargs['scheme'] = 'posix_prefix'
+    # The presence of the rpm_prefix scheme indicates that posix_prefix
+    # has been patched to inject `local` into the installation locations.
+    # The rpm_prefix scheme is a backup of what posix_prefix was before it was
+    # patched.
+    elif 'rpm_prefix' in sysconfig.get_scheme_names():
+        kwargs['scheme'] = 'rpm_prefix'
 
     return Path(sysconfig.get_path(name, **kwargs))