Andy Alt 004e68f5a0
cmake:add c++11 flag (#262)
* cmake:add c++11 flag

to prevent errors such as this:

https://travis-ci.org/ZetaGlest/zetaglest-source/builds/436849785
2018-10-03 21:18:37 -05:00
..
2018-10-03 21:18:37 -05:00