[all] use explicit void parameter lists

This makes it a compile-time error to call a function that semantically
takes no parameters with a nonzero number of arguments.

Previously, such code would still compile, but risk blowing up the stack
if a compiler chose to use something other than caller-cleanup calling
conventions.

common/src/platform/windows/sysinfo.c

@@ -19,13 +19,13 @@ Place, Suite 330, Boston, MA 02111-1307 USA
 
 #include <windows.h>
 
-int sysinfo_gfx_max_multisample()
+int sysinfo_gfx_max_multisample(void)
 {
   //FIXME: Implement this
   return 4;
 }
 
-long sysinfo_getPageSize()
+long sysinfo_getPageSize(void)
 {
   SYSTEM_INFO si;
   GetSystemInfo(&si);