travis: move IBM backwards in time
Using Ubuntu's cross-toolchains for powerpc* and s390x meant they were depending on glibc symbols from Ubuntu 16.04. And if that host is ever updated to a new release, the toolchains would raise the bar too. This switches powerpc, powerpc64, and s390x to use crosstool-ng toolchains, configured approximately like RHEL6 with kernel 2.6.32 and glibc 2.12. This ABI level should also be compatible with Debian 7 (wheezy) and Ubuntu 12.04 (precise). For powerpc64le, the challenge was that only glibc-2.19 officially added support, but RHEL7 backported those changes to glibc-2.17. The backport patches are complex and numerous, so instead of trying to push those into crosstool-ng, this just uses glibc binaries directly from CentOS 7 and builds the toolchain manually. This is ported from rust-lang/rust-buildbot#149. r? @alexcrichton
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