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/160379609706.24746.7506163279454026608@wrigleys.postgresql.org

Backpatch-through: 9.5

diff --git a/doc/src/sgml/libpq.sgml b/doc/src/sgml/libpq.sgml
index c51fe03d9d85481ceaee5a87a4d4920fbbe6ab4b..0d2874c50800f1cd403f224527030fbc46087534 100644 (file)
--- a/doc/src/sgml/libpq.sgml
+++ b/doc/src/sgml/libpq.sgml
@@ -8141,14 +8141,6 @@ 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</> 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>