Revamp CMake support #689

Job	Run time
build (shared, sqlite3, ubuntu-22.04)	48s
build (shared, postgresql, ubuntu-22.04)	1m 36s
build (shared, mysql, ubuntu-22.04)	56s
build (shared, firebird, ubuntu-22.04)	1m 6s
build (shared, oracle, ubuntu-22.04)	1m 41s
build (shared, odbc, ubuntu-22.04)	1m 23s
build (shared, empty, ubuntu-22.04)	29s
build (shared, valgrind, ubuntu-22.04)	2m 26s
build (static, sqlite3, ubuntu-22.04)	52s
build (static, postgresql, ubuntu-22.04)	55s
build (static, mysql, ubuntu-22.04)	52s
build (static, firebird, ubuntu-22.04)	1m 3s
build (static, oracle, ubuntu-22.04)	1m 42s
build (static, odbc, ubuntu-22.04)	1m 10s
build (static, empty, ubuntu-22.04)	30s
build (static, valgrind, ubuntu-22.04)	2m 34s
build (postgresql, macos-11)	1m 27s
build (sqlite3, macos-11)	1m 29s
build (empty, macos-11)	59s
	23m 58s

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