[patch #8847] AX_PTHREAD: improve support for Solaris

Follow-up Comment #6, patch #8847 (project autoconf-archive):

Is there some other preprocessor symbol that is defined/changed when -mt is
given in this recent version? I'm surprised that they removed the definition
of _REENTRANT rather than just conditionals that use it, especially when user
code might want to key off of it.

Being able to detect -mt using the preprocessor one way or another was an easy
way to make this pthreads check more robust, so I'd like to see if there's an
alternative. Either way, would you know the __SUNPRO_C version number where
this changed?

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