No longer consider automake warnings as fatal
With automake 1.14 there are a lot of new warnings related to the way we deal with MEX files (they are compiled from source files located in a different tree). Automake wants us to use the 'subdir-objects' option, but it breaks in our case. In automake 2.0, the 'subdir-objects' option will be activated by default, so we will have to refactor the build system for MEX files. But for now we can live with the automake warnings.