[PATCH] move check-gcc parallelize value into C front end

[Jim Wilson]

Every check_$lang_parallelize setting is in the language specific
Make-lang.in file except for the C front-end check_gcc_parallelize
setting which is in the toplevel Makefile.in file.  This seems to be
an oversight, as it was only 3 years ago that the c/ subdir was
created, and the check_gcc_parallelize variable looks like it might be
gcc generic, but it is actually C front end specific as it only affect
check-gcc which is a C front end target.  This patch moves the
variable into the C front end where it belongs.  This also
consolidates the change_$lang_parallelize docs, which are currently
spread across two places.  It also needs to fix two places that
directly refer to the check_gcc_parallelize setting in Makefile.in,
and change them to references to the generic docs.

Also, while looking at this, I noticed that there is no
check_gnat_parallelize set, and check-gnat seems to be the only
testsuite target that hasn't already been parallelized.  This also
looks like an oversight, but I haven't tested a patch for that yet.

Jim
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