ippl.build: use 'em.set_docfiles()' to define files going into doc-dir

scripts/ippl.build

@@ -18,16 +18,9 @@ function em.configure() {
 		|| exit 1 
 }
 
-function em.install_doc() {
-	install -m 0444 \
-		LICENSE \
-		README \
-		"${DOCDIR}"
-}
-
 em.add_to_family 'MPI'
 em.set_runtime_dependencies "${COMPILER}" "${MPI}"
 em.set_build_dependencies 'cmake' "${COMPILER}" "${MPI}"
+em.set_docfiles LICENSE README
 em.make_all
 
-