gtk 3.22 depends on pango 1.37.3 so we can remove any PANGO_CHECK_VERSIONS for before that version

Testing Done:
Verified the pango version required at https://gitlab.gnome.org/GNOME/gtk/-/blob/b51255b6a7a883e4e5977057707205ab8f225d55/configure.ac#L57

Compiled locally without issue.

Reviewed at https://reviews.imfreedom.org/r/257/