Set bjam timeout to maximum of -l options on command line.

Patch to ensure that maximum value is selected when there's
multiple -l timeout options.



[SVN r66705]

tools/build

@@ -1 +1 @@
-Subproject commit cceaba7bfe228b5ae6ce4281f9c567d242f10bd2
+Subproject commit ac9f2c68b63ec80e9348197345f607cd67b281ee