THREAD_SUPPORT

There is no reference to THREAD_SUPPORT outside configure, and it is
never set, so remove it.

configure

@@ -21323,16 +21323,6 @@ for thread safety." >&2;}
    { (exit 1); exit 1; }; }
 fi
-if test "$THREAD_SUPPORT" = no; then
-{ { $as_echo "$as_me:$LINENO: error: cannot enable threads on this platform
-This platform is known to not support thread-safe programs.  For details,
-compile and run src/bin/pg_thread_test." >&5
-$as_echo "$as_me: error: cannot enable threads on this platform
-This platform is known to not support thread-safe programs.  For details,
-compile and run src/bin/pg_thread_test." >&2;}
-   { (exit 1); exit 1; }; }
-fi
-
 # Check for *_r functions
 _CFLAGS="$CFLAGS"
 _LIBS="$LIBS"

configure.in

 dnl Process this file with autoconf to produce a configure script.
-dnl $PostgreSQL: pgsql/configure.in,v 1.612 2009/10/01 01:58:57 tgl Exp $
+dnl $PostgreSQL: pgsql/configure.in,v 1.613 2009/11/30 16:50:38 momjian Exp $
 dnl
 dnl Developers, please strive to achieve this order:
 dnl
@@ -1407,12 +1407,6 @@ PostgreSQL does not support platforms that require a special compiler
 for thread safety.])
 fi
 
-if test "$THREAD_SUPPORT" = no; then
-AC_MSG_ERROR([cannot enable threads on this platform
-This platform is known to not support thread-safe programs.  For details,
-compile and run src/bin/pg_thread_test.])
-fi
-
 # Check for *_r functions
 _CFLAGS="$CFLAGS"
 _LIBS="$LIBS"