cmake/pkgconfig: use CMAKE_INSTALL_FULL_* variables #913

Job	Run time
Build static on ubuntu-latest	1m 20s
Build on ubuntu-20.04 g++-7	51s
Build on ubuntu20.04 aarch64 g++-8	10m 30s
Build on ubuntu-20.04 g++-8	56s
Build on ubuntu20.04 aarch64 g++-9	8m 20s
Build on ubuntu-latest g++-9	57s
Build on ubuntu20.04 aarch64 g++-10	8m 59s
Build on ubuntu-latest g++-10	1m 2s
Build on ubuntu22.04 aarch64 g++-12	9m 34s
Build on ubuntu-20.04 clang-7	1m 2s
Build on ubuntu20.04 aarch64 clang-9	13m 11s
Build on ubuntu-20.04 clang-8	59s
Build on ubuntu20.04 aarch64 clang-10	15m 18s
Build on ubuntu-20.04 clang-9	1m 0s
Build on ubuntu22.04 aarch64 clang-14	13m 1s
Build on ubuntu-20.04 clang-10	57s
Build on ubuntu22.04 armv7 g++	9m 18s
Build on ubuntu-20.04 clang-11	54s
Build on ubuntu22.04 ppc64le g++-12	9m 6s
Build on ubuntu-latest clang-12	1m 1s
build-macos (macos-latest)	28s
Build on ubuntu22.04 s390x g++-12	7m 42s
Build on ubuntu-latest clang-13	1m 11s
build-macos (flyci-macos-large-latest-m2)	23s
Build on ubuntu22.04 riscv64 g++-12	10m 49s
Build on ubuntu-latest clang-14	1m 20s
build-windows	1m 29s
	2h 11m 38s

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