[install] Be more specific about what scripts we want to install.

We now have a subdirectory containing register definitions in scripts,
this confuses the install command so we have to be more specific about
which scripts to install. We actually only want to install the black
magic scripts from there as they are useful for locm3 users.

Makefile

@@ -82,7 +82,7 @@ install: lib
 	$(Q)$(INSTALL) -m 0644 lib/*.ld $(LIBDIR)
 	$(Q)$(INSTALL) -m 0644 lib/efm32/*/*.ld $(LIBDIR)
 	@printf "  INSTALL scripts\n"
-	$(Q)$(INSTALL) -m 0644 scripts/* $(SHAREDIR)
+	$(Q)$(INSTALL) -m 0644 scripts/*.scr $(SHAREDIR)
 
 doc:
 	$(Q)$(MAKE) -C doc html