Make program_options compile with disabled exceptions.

It appears the all throw statements are during the
parsing, so alternative error reporting strategies are
possible. 
Closes #2096.


[SVN r53723]

libs/program_options

@@ -1 +1 @@
-Subproject commit badade784298ff646b7867f8da5da80a212ae40b
+Subproject commit 354717d9c9c8543fdae5617b41a3b8565e0c1040