Ensure HAVE_CXX11 is checked when defining TINS_IS_CXX11
Ensure HAVE_CXX11 is checked when defining TINS_IS_CXX11

Include config.h in cxxstd.h

salessandri/libtins,salessandri/libtins,mfontanini/libtins,viveks9/decrypt80211,hanw/libtins,UlfWetzker/libtins,zmb3/libtins,capturePointer/libtins,wavelets/libtins,UlfWetzker/libtins,bowlofstew/libtins,zmb3/libtins,viveks9/decrypt80211,hanw/libtins,bowlofstew/libtins,wavelets/libtins,rklabs/libtins,capturePointer/libtins,mfontanini/libtins,rklabs/libtins