cross-*-musl*: rebuild musl with PIC #16325
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This was referenced Nov 10, 2019
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This is necessary because if musl is not built with PIC in the environment, things that need to link as static PIE when cross compiling will not build (notably #16320). The target musl is okay because the "final" gcc is built with
--enable-default-piebut the cross musl is built with the bootstrap gcc.