Add cude include paths to global build target in order to include cuda headers in c++ code.

Restrict compilation of cuda sources to *.cu and *.c files. The rest should be built via the normal target.

git-svn-id: http://www.openflipper.org/svnrepo/OpenFlipper/branches/Free@11769 383ad7c9-94d9-4d36-a494-682f7c89f535