configure.ac: require pthread-stubs only where available

The project is a thing only for BSD platforms. Or in other words - for
any other platforms building/installing pthread-stubs results only in a
pthread-stub.pc file.

And even where it provides a DSO, there's a fundamental design issue
with it - see the pthread-stubs mailing list for the specifics.

v2: Update comment above the switch statement (Jon Turney).

Reviewed-by: Jeremy Huddleston Sequoia <[email protected]>
Acked-by: Gary Wong <[email protected]>
Tested-by: Eric Engestrom <[email protected]>
Acked-by: Randy Fishel <[email protected]>
Cc: Niveditha Rau <[email protected]>
Signed-off-by: Emil Velikov <[email protected]>

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