Don't build blas, lapack, fft we're going to use external ones anyway.

Åke Sandgren, 20200609
diff -ru elk-6.8.4.orig/Makefile elk-6.8.4/Makefile
--- elk-6.8.4.orig/Makefile	2019-09-27 09:27:37.921633455 +0200
+++ elk-6.8.4/Makefile	2020-06-09 18:17:22.186598427 +0200
@@ -4,7 +4,7 @@
 include make.inc
 
 all:
-	cd src; $(MAKE) all
+	cd src; $(MAKE) elk
 	cd src/eos; $(MAKE)
 	cd src/spacegroup; $(MAKE)