[PATCH] gcc parallel make check

[VandeVondele Joost]

> a newer patch (v8) I'll send soon

attached with updated changelog. Compared to the previously posted v6, only the libstdc++-v3/testsuite/Makefile.am has been refined to split a little more the e*/* pattern, and two quickly running goal have been merged, in addition to fixing the pre-exisiting error in some of the patterns in that file.

Checked comparing testsuite results before after. 

Obviously, if Jakub's patch can be made to work around the testsuite special cases, I believe it should be superior. If not, the attached patch is working as far as I can tell, and provides a significant improvement over current trunk.

Joost
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