Add x86_64-musl as a host architecture#55163

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strfry wants to merge 10 commits intorust-lang:masterfrom

Commits on Nov 27, 2018

musl-toolchain: fix global lib paths (dont create /lib/libc.so)
strfry
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Commits on Dec 6, 2018

musl: enable dynamic linking in the spec

mati865
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strfry
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fix RelroLevel
strfry
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Commits on Dec 7, 2018

Revert "Set RUSTFLAGS env to make dylib work"
strfry
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