use ansi c declarations

git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@15435 ec53bebd-3082-4978-b11e-865c3cabbd6b

cf/check-x.m4

@@ -34,11 +34,11 @@ if test "$no_x" != yes; then
 		LIBS="$ac_save_libs $foo $X_PRE_LIBS -lX11 $X_EXTRA_LIBS"
 		AC_RUN_IFELSE([
 		#include <X11/Xlib.h>
-		foo()
+		foo(void)
 		{
 		XOpenDisplay(NULL);
 		}
-		main()
+		main(int argc, char **argv)
 		{
 		return 0;
 		}