COMP: Remove unused CMAKE_C_FLAGS for JsonCpp build.
Merge pull request #272 from TubeTK/cppcheck-flags

COMP: Remove unused CMAKE_C_FLAGS for JsonCpp build.
COMP: Remove unused JsonCpp linker flags.
Merge pull request #273 from thewtex/jsoncpp-linker-flags

COMP: Remove unused JsonCpp linker flags.