[llvm-commits] [PROPOSAL] Add --program-prefix support to build

[Rick Foos]

This patch adds --program-prefix support to the autoconf build.

The cmake build isn't changed.

makefile.rules now has program_prefix from configure. Some install rules 
need it with Destdir.

In configure.ac, A trap for the program_prefix = NONE before AC_SUBST is 
needed. Configure ususally doesn't export 
program-<prefix|suffix|transform> variables, and the NONE default value 
can escape w/o a trap.

config.guess is updated to 2012-08-14. No platforms are removed. Hexagon 
is added.

--program-suffix wasn't included as it might interfere with the EXEEXT 
variables, and goes beyond the scope of this patch.

Thank you,
-rick

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