jansson 2.3.1
jansson 2.3.1

Upgrade Jansson to version 2.3.1.
Tested both universal on native on Lion with clang and llvm from
XCode-4.3.3.

Closes #12836.

Signed-off-by: Jack Nagel <43386ce32af96f5c56f2a88e458cb94cebee3751@gmail.com>

sakra/homebrew,sakra/homebrew,sakra/homebrew,sakra/homebrew