build-pedantic: use main(void)

Main has unused parameters argc and argv. Since they are unused and
C 99 allows to prototype main as 'int main(void)',
remove them and replace by void. It fixes build when unused parameters
are treated as errors.

Signed-off-by: Marek Chalupa <mchqwerty@gmail.com>
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>

test/build-pedantic.c

@@ -3,6 +3,6 @@
 /* This is a build-test only */
 
 int
-main(int argc, char **argv) {
+main(void) {
 	return 0;
 }