Gnu compiler and ECW V5.2 linking Errors - Solved

[jfloyd]

Issue with gcc-5.3 maybe earlier.

Compiler generate code using std::cxx11::basic_string Binary ECW library has code using std::basic_string.

Results in undefined functions due to changes in the abi being used.

Fix by adding -D_GLIBCXX_USE_CXX11_ABI=0 to all compile statements.

Tried just adjusting the ECW compile but this option must apply across the whole suite else segmentation errors arise.

Possibly needed for all ECW binary libraries.

[Even Rouault]

I've captured this in ​https://trac.osgeo.org/gdal/wiki/ECW