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Add builddir/lib to include paths to all Makefile.am
Add fcntl-h in imported gnulib modules

This is necessary for using O_CLOEXEC flag.
Search also in pthread for clock_* functions

pthread-win32 implements replacement of clock_gettime and clock_nanosleep.
So pthread must be checked to avoid useless (and maybe incompatible)
replacement functions.
Accept ';' as end of statement in config file
Report better origin of parser error

If the parser error is originated from device option string, report so in
the error message instead of printing a null string