Use SC_BINARY_DIR for generating and installing files

If we're using SC_BINARY_DIR to generate these files, need to
 use it for the install rule too - SC_BINARY_DIR doesn't always equal
 CMAKE_BINARY_DIR

git-svn-id: svn://svn.code.sf.net/p/brlcad/code/brlcad/trunk@57348 2f96ce8b-6d43-0410-b8df-bffccc660ffb