Commits on Feb 26, 2016

1. mk: Move disable-jemalloc logic into makefiles …

   The `--disable-jemalloc` configure option has a failure mode where it will
   create a distribution that is not compatible with other compilers. For example
   the nightly for Linux will assume that it will link to jemalloc by default as
   an allocator for executable crates. If, however, a standard library is used
   which was built via `./configure --disable-jemalloc` then this will fail
   because the jemalloc crate wasn't built.
   
   While this seems somewhat reasonable as a niche situation, the same mechanism is
   used for disabling jemalloc for platforms that just don't support it. For
   example if the rumprun target is compiled then the sibiling Linux target *also*
   doesn't have jemalloc. This is currently a problem for our cross-build nightlies
   which build many targets. If rumprun is also built, it will disable jemalloc for
   all targets, which isn't desired.
   
   This commit moves the platform-specific disabling of jemalloc as hardcoded logic
   into the makefiles that is scoped per-platform. This way when configuring
   multiple targets **without the `--disable-jemalloc` option specified** all
   targets will get jemalloc as they should.

   

   alexcrichton committed Feb 26, 2016
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