Makefile: add .DELETE_ON_ERROR:

The absence of it was allowing an (m4-produced) syntax error in in a change I had made to be masked.

Makefile: add .DELETE_ON_ERROR:
007d6fc1 · Luke Shumaker · Jan Alexander Steffens (heftig) · 4f23609d · 007d6fc1
Unverified Commit 007d6fc1 authored 7 years ago by Luke Shumaker Committed by Jan Alexander Steffens (heftig) 7 years ago
--- a/Makefile
+++ b/Makefile
@@ -115,4 +115,4 @@ upload:
 	scp devtools-$(V).tar.gz devtools-$(V).tar.gz.sig repos.archlinux.org:/srv/ftp/other/devtools/

 .PHONY: all clean install uninstall dist upload
-
+.DELETE_ON_ERROR: