docs: remove reference to src/tools/thread

bmomjian · bmomjian · commit 1e57c73779cf · 2020-10-27T12:43:11.000-04:00
This directory and the ability to build the thread test independently were removed in commit 8a21211. Reported-by: e.indrupskaya@postgrespro.ru Discussion: https://postgr.es/m/160379609706.24746.7506163279454026608@wrigleys.postgresql.org Backpatch-through: 9.5
diff --git a/doc/src/sgml/libpq.sgml b/doc/src/sgml/libpq.sgml
@@ -8210,14 +8210,6 @@ int PQisthreadsafe();
    <application>libpq</application> source code for a way to do cooperative
    locking between <application>libpq</application> and your application.
   </para>
-
-  <para>
-   If you experience problems with threaded applications, run the program
-   in <filename>src/tools/thread</filename> to see if your platform has
-   thread-unsafe functions.  This program is run by
-   <filename>configure</filename>, but for binary distributions your
-   library might not match the library used to build the binaries.
-  </para>
  </sect1>
 
 
