libschedutil: use preprocessor symbols for flags #2505

Job	Run time
validate commits	0s
Generate build matrix	7s
python linting	28s
spelling	6s
bookworm - test-install	12m 40s
bookworm - 32 bit	14m 31s
noble - test-install	12m 41s
el9 - test-install	12m 2s
alpine - test-install	12m 32s
fedora40 - test-install	12m 11s
jammy - test-install	11m 48s
focal - py3.8	17m 4s
bookworm - gcc-12,content-s3,distcheck	19m 48s
fedora40 - clang-18	16m 55s
coverage	24m 20s
el8 - ascii	19m 31s
el8 - test-install	13m 24s
el8 - system,coverage	7m 37s
inception	22m 1s
flux-pmix check	13m 10s
flux-pam check	4m 19s
flux-sched check	7m 0s
macos build only	2m 53s
flux-accounting check	4m 38s
Generate docker manifest	1s
	4h 21m 47s

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