docs:  remove reference to src/tools/thread

This directory and the ability to build the thread test independently
were removed in commit 8a2121185b.

Reported-by: [email protected]

Discussion: 
https://postgr.es/m/[email protected]

Backpatch-through: 9.5

Branch
------
REL_13_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/d04c4a8f7066bdac71d012fa868ba9d84538632e

Modified Files
--------------
doc/src/sgml/libpq.sgml | 8 --------
1 file changed, 8 deletions(-)

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