Added I_GetTickCount() system function

Author: jval1972

i_system.pas

@@ -332,6 +332,13 @@ function I_SetDPIAwareness: boolean;
   usemmx: boolean = true;
   win_vista_or_newer: boolean = true;
 
+//==============================================================================
+//
+// I_GetTickCount
+//
+//==============================================================================
+function I_GetTickCount: LongWord;
+
 implementation
 
 uses
@@ -1132,6 +1139,16 @@ function I_SetDPIAwareness: boolean;
   FreeLibrary(dllinst);
 end;
 
+//==============================================================================
+//
+// I_GetTickCount
+//
+//==============================================================================
+function I_GetTickCount: LongWord;
+begin
+  Result := GetTickCount;
+end;
+
 initialization
   basetime := 0;