Need to quote test for posix_threads on HPUX11

configure

 #! /bin/sh
-# From configure.in Revision: 1.360 .
+# From configure.in Revision: 1.361 .
 # Guess values for system-dependent variables and create Makefiles.
 # Generated by GNU Autoconf 2.53 for python 2.3.
 #
@@ -11214,7 +11214,7 @@ _ACEOF
 fi
 
 
-    if test $posix_threads != "yes"; then
+    if test "$posix_threads" != "yes"; then
       echo "$as_me:$LINENO: checking for thr_create in -lthread" >&5
 echo $ECHO_N "checking for thr_create in -lthread... $ECHO_C" >&6
 if test "${ac_cv_lib_thread_thr_create+set}" = set; then

configure.in

@@ -1360,7 +1360,7 @@ pthread_create (NULL, NULL, start_routine, NULL)], [
     THREADOBJ="Python/thread.o"
     USE_THREAD_MODULE=""])
 
-    if test $posix_threads != "yes"; then     
+    if test "$posix_threads" != "yes"; then     
       AC_CHECK_LIB(thread, thr_create, [AC_DEFINE(WITH_THREAD)
       LIBS="$LIBS -lthread"
       THREADOBJ="Python/thread.o"