build

Switch to new `panic=immediate-abort` flag (#86) #165

Job	Run time
no_std-win (nightly)	43s
Default (ubuntu-latest, stable)	15s
Default (windows-latest, nightly)	49s
Default (ubuntu-latest, nightly)	17s
Default (windows-latest, stable)	38s
no_std (macos-latest, stable)	17s
build-std (build_std)	51s
no_std (ubuntu-latest, stable)	16s
no_main-win (nightly)	39s
no_std-win (stable)	46s
no_main-win (stable)	43s
build-std (no_main/nix)	50s
no_std (ubuntu-latest, nightly)	14s
Default (macos-latest, stable)	19s
Default (macos-latest, nightly)	23s
no_std (macos-latest, nightly)	21s
	8m 21s

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