[1.22] Fix some pkg-config metadata
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gst, pango: Add missing pkg-config dependencies
Adding automated tests for the Debian -dev packages, which link a trivial program to the pkg-config module under test, revealed that these .pc files were not self-contained. Add the necessary dependencies for linking to succeed.
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cogl-pango-2.0-experimental.pc: Reference correct library name
It's libcogl-pango.so, not libcoglpango.so.