Disable gason on gcc currently
Disable gason on gcc currently

Premake cannot set -std=c++11 for only .cpp file. The single c file has
problem with -std=c++11.

tesis100/nativejson-benchmark,tesis100/nativejson-benchmark,DavadDi/nativejson-benchmark,DavadDi/nativejson-benchmark,miloyip/nativejson-benchmark,miloyip/nativejson-benchmark,miloyip/nativejson-benchmark,wangfakang/nativejson-benchmark,wangfakang/nativejson-benchmark,miloyip/nativejson-benchmark,tesis100/nativejson-benchmark,wangfakang/nativejson-benchmark,DavadDi/nativejson-benchmark,wangfakang/nativejson-benchmark,DavadDi/nativejson-benchmark,tesis100/nativejson-benchmark,DavadDi/nativejson-benchmark,tesis100/nativejson-benchmark,wangfakang/nativejson-benchmark,tesis100/nativejson-benchmark,wangfakang/nativejson-benchmark,miloyip/nativejson-benchmark