Stop building prefs.c

The only tiny function in there that was still needed seems to fit
nicely into main.c

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

Makefile

@@ -57,7 +57,6 @@ SOURCES = \
 	info.c \
 	main.c \
 	parse-xml.c \
-	prefs.c \
 	profile.c \
 	save-xml.c \
 	sha1.c \

main.c

@@ -40,6 +40,11 @@ struct preferences default_prefs = {
 #endif
 };
 
+struct units *get_units()
+{
+	return &prefs.units;
+}
+
 /* random helper functions, used here or elsewhere */
 static int sortfn(const void *_a, const void *_b)
 {