Build warning

[Irubataru]

Could you please remove the #warning statements from QDP? It really clutters compilation of any software that use QDP as a framework. The #warning label was never intended to provide information, they are there as genuine warnings, things that should be fixed. Telling the user that they are compiling with SSE intrinsics is not something you have to warn about, in that case put the information in the configure script and not in the library headers.