[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/windebug.c

@@ -58,7 +58,7 @@ inline static BOOL CompareWindowsVersion(DWORD dwMajorVersion, DWORD dwMinorVers
   return VerifyVersionInfo(&ver, VER_MAJORVERSION | VER_MINORVERSION, dwlConditionMask);
 }
 
-bool IsWindows8()
+bool IsWindows8(void)
 {
   return
     (CompareWindowsVersion(6, 3) == TRUE) ||