pkgconfig files have wrong prefixes

The pkgconfig files sequoia.pc and sequoia-openpgp.pc.in define the wrong prefix: It is the build directory, while it should be the installation prefix.

This is caused by openpgp-ffi/Makefile replacing PREFIX in /openpgp-ffi/sequoia-openpgp.pc.in be $(shell pwd). Same for ffi/sequoia.pc.in.

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