Avoid non-ANSI function declarations

Sparse says things like:

	warning: non-ANSI function declaration of function 'calc_ttl'

Signed-off-by: John Keeping <john@keeping.me.uk>

ui-repolist.c

@@ -117,7 +117,7 @@ static void print_sort_header(const char *title, const char *sort)
 	htmlf("'>%s</a></th>", title);
 }
 
-static void print_header()
+static void print_header(void)
 {
 	html("<tr class='nohover'>");
 	print_sort_header("Name", "name");
@@ -247,7 +247,7 @@ static int sort_repolist(char *field)
 }
 
 
-void cgit_print_repolist()
+void cgit_print_repolist(void)
 {
 	int i, columns = 3, hits = 0, header = 0;
 	char *last_section = NULL;
@@ -344,7 +344,7 @@ void cgit_print_repolist()
 	cgit_print_docend();
 }
 
-void cgit_print_site_readme()
+void cgit_print_site_readme(void)
 {
 	if (!ctx.cfg.root_readme)
 		return;