Don't instantiate std::vector with incomplete type, this is not allowed.

Thanks to Jonathan Wakely for the report.


[SVN r23942]

libs/program_options

@@ -1 +1 @@
-Subproject commit 2aa09ac7b254c2ca2c2db33ab278e4c37aebcda0
+Subproject commit 138d959d6803d0c494832f6fd322f94581b6cf25