Fix gcc 5.4 build #65
                
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This PR adds the CXX switch -std=c++11 in config-linux-gcc.py.
I don't know why I'm the first to hit this, but If I don't specify -std=c++11, I get the same build errors as in this issue:
#7
I'm building from a minimal Ubuntu 16.04 docker file.
I noticed the debug variant already had the c++11 switch at the end, I moved it to the front.
There's an extra -fPIC switch in CXXFLAGS in the debug variant.
Removed it and it's still added to every g++ calls so it's unnecessary.