m4sh: fix xfind_file.
m4sh: fix xfind_file.

Some factoring would be welcome here.

	* build-aux/base.m4sh (xfind_file): Bounce to find_File.
	(find_prog): Rename the first definition as...
	(find_file): this.

aldebaran/libport,aldebaran/libport,aldebaran/libport,aldebaran/libport,aldebaran/libport