Avoid use of printf()/fprintf()

Use one of the following functions where appropriate:

* puts() (whenever we print hard coded strings to stdout)
* fputs() (whenever we print hard coded strings to a stream)
* putchar() (whenever we print a single character to stdout)
* fputc() (whenever we print a single character to a stream)
* strncpy() (whenever we copy hard coded strings to a buffer)

This removes the overhead introduced by the format string parser and
reduces the number of false positive C-format strings spotted by
xgettext(1)'s heuristics.

Signed-off-by: Lukas Fleischer <calcurse@cryptocrack.de>

src/todo.c

@@ -391,7 +391,7 @@ display_todo_item (int incolor, char *msg, int prio, int note, int width, int y,
   if (prio > 0)
     snprintf (priostr, sizeof priostr, "%d", prio);
   else
-    snprintf (priostr, sizeof priostr, "X");
+    strncpy (priostr, "X", sizeof priostr);
 
   if (incolor == 0)
     custom_apply_attr (w, ATTR_HIGHEST);