Switch from using Win-1252 encoding to C++ character literals to allow -Wextra -Wall to compile (#5414).

Put a double quote after every hex string literal and then use string concatenation to make sure that none of the hex literals is misinterpreted by Visual Studio.

See: http://msdn.microsoft.com/en-us/library/6aw8xdf2.aspx


git-svn-id: https://svn.osgeo.org/gdal/trunk@28144 f0d54148-0727-0410-94bb-9a71ac55c965
Merge branch 'trunk' into trunk_mingw