Use standard CMake variables - static/shared lib.
Use standard CMake variables - static/shared lib.

Replace JSONCPP_LIB_BUILD_SHARED => BUILD_SHARED_LIBS
Replace JSONCPP_LIB_BUILD_STATIC => BUILD_STATIC_LIBS
Removed workaround  https://github.com/open-source-parsers/jsoncpp/issues/51
Removed OPTION for shared/static in this file.

Streamlet/GoogleHelper,Streamlet/GoogleHelper,Streamlet/GoogleHelper,Streamlet/GoogleHelper,Streamlet/GoogleHelper