[libstdc++-v3] Add configure check for S_ISSOCK

[Andris Pavenis]

src/filesystem/ops-common.c uses S_ISSOCK unconditionally without checking that it is available

As result compile fails for DJGPP when S_ISREG is available but S_ISSOCK is not. Included patch add 
configure check for S_ISSOCK

Andris

ChangeLog entry:

2017-11-07Â  Andris Pavenis<andris.pavenis.iki.fi>

 Â Â Â  * acinclude.m4 (GLIBCXX_CHECK_S_ISSOCK): Define
 Â Â Â  * configure.ac: Check presence of S_ISSOCK
 Â Â Â  * src/filesystem/ops-common.h: Only use S_ISSOCK if defined for target
 Â Â Â  * config.h.in: Regenerate
 Â Â Â  * configure: Regenerate




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