rollback the previous acx_pthread.m4 fix.

m4/acx_pthread.m4

@@ -272,11 +272,9 @@ if test "x$acx_pthread_ok" = xyes; then
 	   AC_TRY_LINK(,, , [done=yes])
 	
 	   if test "x$done" = xyes ; then
-	      AC_MSG_RESULT([yes])
-	      done="no"
-	   else
 	      AC_MSG_RESULT([no])
-	      done="yes"
+	   else
+	      AC_MSG_RESULT([yes])
 	   fi
 	fi