poppler build issues after 22.01.0 update

[Claes Nästén <pekdon%gmail.com@localhost>]

Hi,

Had issues building poppler on Solaris, should apply to other users of
GCC 7 and 8 having the
<filesystem> header that might be lacking on the system provided GCC
of NetBSD 9 (I thought
I saw that somewhere?)

Anyway, attached a patch that if compiled using GCC will skip the use
of std::filesystem and
use the old unlink behaviour instead of having to sort out the link of
the extra library required.

This patch check against > 8,
https://en.cppreference.com/w/cpp/filesystem says 9.1 but the
CMake module I found for the check claimed 9.0.

This could of course be extended to check for clang version but clang
in pkgsrc should be
more than recent enough.

Regards,
Claes Nästén

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