Run autoheader to add a few missing #defines to pg_config.h.in.

These are emitted by the new ax_pthread.m4 script version. They are not
used for anything in PostgreSQL, but let's keep the generated header file
up-to-date.

Andres Freund

Author: hlinnaka

src/include/pg_config.h.in

@@ -391,9 +391,15 @@
 /* Define to 1 if the PS_STRINGS thing exists. */
 #undef HAVE_PS_STRINGS
 
+/* Define if you have POSIX threads libraries and header files. */
+#undef HAVE_PTHREAD
+
 /* Define to 1 if you have the `pthread_is_threaded_np' function. */
 #undef HAVE_PTHREAD_IS_THREADED_NP
 
+/* Have PTHREAD_PRIO_INHERIT. */
+#undef HAVE_PTHREAD_PRIO_INHERIT
+
 /* Define to 1 if you have the <pwd.h> header file. */
 #undef HAVE_PWD_H
 
@@ -746,6 +752,10 @@
    process. */
 #undef PROFILE_PID_DIR
 
+/* Define to necessary symbol if this constant uses a non-standard name on
+   your system. */
+#undef PTHREAD_CREATE_JOINABLE
+
 /* RELSEG_SIZE is the maximum number of blocks allowed in one disk file. Thus,
    the maximum size of a single file is RELSEG_SIZE * BLCKSZ; relations bigger
    than that are divided into multiple files. RELSEG_SIZE * BLCKSZ must be