rm version from toolchain names #413

Job	Run time
buildifier	16s
build-without-terminfo (gcc)	7m 51s
build-without-terminfo (clang)	8m 2s
test (gcc)	7m 49s
test (gcc, asan)	8m 1s
test (gcc, tsan)	7m 52s
test (gcc, ubsan)	8m 25s
test (clang)	7m 39s
test (clang, asan)	8m 11s
test (clang, tsan)	8m 11s
test (clang, ubsan)	8m 45s
build (--config=clang-format)	7m 56s
build (--config=clang-tidy)	14m 23s
build (--compilation_mode=opt)	14m 24s
	1h 57m 45s

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