[v3] check-compile

[Benjamin Kosnik]

Hey y'all.

This patch adds another specialized rule for checking: a "make check-compile" rule. 

This is just a shorthand make rule for compiling all the libstdc++ test
files with a given TEST_FLAG, and not caring about linking or executing.

It's useful for timing the compiler, and also for syntax checking
libstdc++  with extra warning flags, and the same with other compilers. 

tested x86/linux

Thoughts?

-benjamin
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