CONC-817: CMake cleanup: fix variable quoting bugs, remove dead code #226

Job	Run time
server 11.8 test suite TEST_OPTION=--ps-protocol	21m 14s
server 11.4 test suite	19m 4s
setup	5s
MariaDB 11.4 (local) - windows 2025	1m 20s
MariaDB 11.4 32bits (local) - windows 2025	1m 27s
MariaDB 12.0	1m 35s
MariaDB 10.11	1m 33s
MariaDB 11.8 (local) - macos	1m 35s
MariaDB 11.4	1m 34s
MariaDB 12.2	1m 32s
MariaDB 10.6	1m 32s
MariaDB 11.8 (local) - windows	1m 20s
MariaDB 12.3 dev	1m 33s
MySQL 8.4	1m 23s
MySQL 8.0	1m 24s
MariaDB 11.8	1m 33s
MariaDB 12.1	1m 33s
	1h 1m 17s

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