upcoming commit), this is the preferred way to do conditional source
files these days. AM can then infer which files to pick up for
distribution without the need for EXTRA_DIST. Also, for mpi/c/profile
and mpi/f77/profile, don't distribute any source files -- just let the
sym links be made by the user. This makes the tarball just slightly
smaller. ;-)
This commit was SVN r2316.
