CI-unixish

Makefile: added `CXXOPTS` and `LDOPTS` to extend `CXXFLAGS` and `LDFLAGS` #812

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Job	Run time
build (clang++, ubuntu-22.04)	28s
build (clang++, ubuntu-24.04)	3m 24s
build (clang++, macos-14)	28s
build (clang++, macos-13)	54s
build (g++, ubuntu-22.04)	24s
build (clang++, macos-15)	46s
build (g++, macos-13)	1m 19s
build (g++, ubuntu-24.04)	1m 58s
build (g++, macos-15)	58s
build (g++, macos-14)	27s
	11m 6s