feat(libexec): bklibcvenv — extract glibc wrapper-script pattern from pantry@5354c73f #342

Job	Run time
local-edit-tests	1m 28s
unavailable	17s
unit-tests	22s
git-clone.com (linux)	1m 44s
stark.com/foo@1.2.3 (linux)	1m 42s
pyapp.com/poetry (linux)	1m 55s
pyapp.com/pip (linux)	1m 52s
fixups.org (mac)	25s
stark.com/foo (mac)	26s
toolchain.com (mac)	38s
git-clone.com (mac)	33s
version-transformer.com (linux)	1m 40s
toolchain.com (linux)	1m 45s
pc-cmake.com (mac)	33s
fix-machos.com (mac)	32s
stark.com/foo (linux)	1m 43s
fix-machos.com (linux)	1m 36s
pyapp.com/poetry (mac)	37s
pc-cmake.com (linux)	1m 41s
stark.com/foo@1.2.3 (mac)	24s
version-transformer.com (mac)	31s
fixups.org (linux)	1m 37s
pyapp.com/pip (mac)	37s
	24m 38s

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