compile: kill preceding space when killing comments

consider:

    repo = "some desc" # some comment

(and note that the regex for recognising a description expects that
dblquote to be the *last* character on the line)

src/gl-compile-conf

@@ -165,7 +165,7 @@ sub parse_conf_file
         s/^ //;
         s/ $//;
         # kill comments
-        s/#.*//;
+        s/\s*#.*//;
         # and blank lines
         next unless /\S/;