CI-unixish

Makefile: added `CXXOPTS` and `LDOPTS` to extend `CXXFLAGS` and `LDFLAGS` #810

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Run time

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Job	Run time
build (g++, ubuntu-22.04)	21s
build (clang++, ubuntu-24.04)	2m 48s
build (clang++, ubuntu-22.04)	24s
build (g++, ubuntu-24.04)	2m 47s
build (g++, macos-13)	1m 37s
build (clang++, macos-14)	31s
build (clang++, macos-15)	34s
build (clang++, macos-13)	1m 3s
build (g++, macos-14)	29s
build (g++, macos-15)	56s
	11m 30s