pkg-config: Updated to 0.27.1.

pkg-config: Updated to 0.27.1.

- Various fixes for using the internal glib snapshot. It should now be
   usable pretty much everywhere with the exception that universal
   builds are not supported on OS X.
 - Remove usage of gettext from the internal glib to avoid gettext and
   libintl dependencies.
 - Update internal glib snapshot to 2.32.4.
 - Fix check for POSIX shell used in tests to work better.
 - Handle spaces in autodetected prefix on Windows.
 - Bugs fixed 3550, 51883, 52031, 53493.

See #10214 for further information.