Check compiler features only for the relevant platform.
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Description

Check compiler features only for the relevant platform.

* mpi/config.links (mpi_cpu_arch): Always set for ARM.  Set for HPPA.
Set to "undefined" for unknown platforms.
(try_asm_modules): Act upon only after having detected the CPU.
* configure.ac: Move the call to config.links before the platform
specific compiler checks.  Check platform specific features only if
the platform is targeted.

There is no need to check x86 options if we are targeting ARM and vice
versa. This may only introduce build problems. With this patch the
summary output at the end of the compiler also shows more reasonable
messages.

(cherry picked from commit 04d478d9b0f92d80105ddaf2c011f40ae8260cfb)