Fix the placement of the LIBC component in filenames for bootstrap sc… #348

Job	Run time
Alpine Linux	2m 3s
FreeBSD-x86_64 with rust stable	1m 53s
Linux-x86_64 with rust stable	3m 5s
Linux-x86_64 (rustls-native-roots) with rust stable	3m 21s
Linux-x86_64 (native-tls) with rust stable	3m 21s
Linux-x86_64 (native-tls-vendored) with rust stable	4m 9s
Linux-aarch64 with rust stable	2m 25s
Linux-arm with rust stable	2m 32s
Linux-i686 with rust stable	1m 56s
Linux-powerpc with rust stable	1m 45s
Linux-powerpc64 with rust stable	1m 58s
Linux-powerpc64le with rust stable	1m 45s
Linux-riscv64 with rust stable	2m 18s
Linux-s390x with rust stable	2m 4s
NetBSD-x86_64 with rust stable	1m 58s
Windows-aarch64 with rust stable	4m 3s
Windows-i686 with rust stable	3m 28s
Windows-x86_64 with rust stable	7m 18s
macOS-x86_64 with rust stable	2m 8s
macOS-aarch64 with rust stable	1m 5s
Linux-x86_64 with rust beta	3m 17s
Linux-x86_64 with rust nightly	3m 11s
	1h 1m 3s

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