Commits on Mar 26, 2018

1. rustbuild: Disable docs on cross-compiled builds …

   This commit disables building documentation on cross-compiled compilers, for
   example ARM/MIPS/PowerPC/etc. Currently I believe we're not getting much use out
   of these documentation artifacts and they often take 10-15 minutes total to
   build as it requires building rustdoc/rustbook and then also generating all the
   documentation, especially for the reference and the book itself.
   
   In an effort to cut down on the amount of work that we're doing on dist CI
   builders in light of recent timeouts this was some relatively low hanging fruit
   to cut which in theory won't have much impact on the ecosystem in the hopes that
   the documentation isn't used too heavily anyway.
   
   While initial analysis in rust-lang#48827 showed only shaving 5 minutes off local builds
   the same 5 minute conclusion was drawn from rust-lang#48826 which ended up having nearly
   a half-hour impact on the bots. In that sense I'm hoping that we can land this
   and test out what happens on CI to see how it affects timing.
   
   Note that all tier 1 platforms, Windows, Mac, and Linux, will continue to
   generate documentation.

   

   alexcrichton committed Mar 26, 2018
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