[patch] libstdc++/60958 disable invalid code in <tr1/regex>

[Jonathan Wakely]

Rather than making small fixes to code that doesn't work anyway, this
just disables the whole block.

(I've included a tweak to the regex testsuite code with this patch, as
I wanted to make that change anyway.)

I'm tempted to do something like this in <tr1/regex>:

#ifndef _GLIBCXX_TR1_REGEX_WARTS_AND_ALL
#error The code in this header doesn't work. If you really want to include it anyway define _GLIBCXX_TR1_REGEX_WARTS_AND_ALL
#endif

Tested x86_64-linux, committed to trunk.

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