build

Fix regression of switching to new `panic=immediate-abort` flag #166

Job	Run time
no_std (ubuntu-latest, nightly)	13s
no_main-win (stable)	47s
no_std (ubuntu-latest, stable)	15s
no_std (macos-latest, stable)	17s
no_main-win (nightly)	39s
no_std (macos-latest, nightly)	18s
no_std-win (nightly)	57s
Default (ubuntu-latest, nightly)	16s
no_std-win (stable)	37s
Default (ubuntu-latest, stable)	16s
build-std (no_main/nix)	49s
Default (macos-latest, nightly)	19s
Default (windows-latest, stable)	32s
Default (windows-latest, nightly)	38s
build-std (build_std)	46s
Default (macos-latest, stable)	22s
	8m 1s

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