[Patch] libstdc++/31621: configure test for --gc-sections

[Paolo Carlini]

Hi,

this problem is ultimately due to the fact that we were using the C++ 
compiler to check for --gc-sections support in the linker. I don't think 
we have a real reason to do that, but I'm CCing Daniel to be sure...

Tested an up-to-date x86_64-linux machine that the problem is fixed, and 
testsuite is still fine. Also double checked on an older x86-linux 
machine, which didn't show the problem.

Paolo.

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