Remove C fallback code

Source/scrollrt.cpp

@@ -2615,11 +2615,7 @@ static void DoBlitScreen(DWORD dwX, DWORD dwY, DWORD dwWdt, DWORD dwHgt)
 		/// ASSERT: assert(! gpBuffer);
 		dwTicks = GetTickCount();
 		while (1) {
-#ifdef __cplusplus
 			hDDVal = lpDDSPrimary->BltFast(dwX, dwY, lpDDSBackBuf, &SrcRect, DDBLTFAST_WAIT);
-#else
-			hDDVal = lpDDSPrimary->lpVtbl->BltFast(lpDDSPrimary, dwX, dwY, lpDDSBackBuf, &SrcRect, DDBLTFAST_WAIT);
-#endif
 			if (hDDVal == DD_OK) {
 				break;
 			}
@@ -2716,17 +2712,10 @@ static void DrawMain(int dwHgt, BOOL draw_desc, BOOL draw_hp, BOOL draw_mana, BO
 		return;
 	}
 
-#ifdef __cplusplus
 	if (lpDDSPrimary->IsLost() == DDERR_SURFACELOST) {
 		if (lpDDSPrimary->Restore() != DD_OK) {
 			return;
 		}
-#else
-	if (lpDDSPrimary->lpVtbl->IsLost(lpDDSPrimary) == DDERR_SURFACELOST) {
-		if (lpDDSPrimary->lpVtbl->Restore(lpDDSPrimary) != DD_OK) {
-			return;
-		}
-#endif
 		ResetPal();
 		ysize = SCREEN_HEIGHT;
 	}
@@ -2736,11 +2725,7 @@ static void DrawMain(int dwHgt, BOOL draw_desc, BOOL draw_hp, BOOL draw_mana, BO
 		dwTicks = GetTickCount();
 		while (1) {
 			DDS_desc.dwSize = sizeof(DDS_desc);
-#ifdef __cplusplus
 			hDDVal = lpDDSPrimary->Lock(NULL, &DDS_desc, DDLOCK_WRITEONLY | DDLOCK_WAIT, NULL);
-#else
-			hDDVal = lpDDSPrimary->lpVtbl->Lock(lpDDSPrimary, NULL, &DDS_desc, DDLOCK_WRITEONLY | DDLOCK_WAIT, NULL);
-#endif
 			if (hDDVal == DD_OK) {
 				break;
 			}
@@ -2807,11 +2792,7 @@ static void DrawMain(int dwHgt, BOOL draw_desc, BOOL draw_hp, BOOL draw_mana, BO
 	}
 
 	if (lpDDSBackBuf == NULL) {
-#ifdef __cplusplus
 		hDDVal = lpDDSPrimary->Unlock(NULL);
-#else
-		hDDVal = lpDDSPrimary->lpVtbl->Unlock(lpDDSPrimary, NULL);
-#endif
 		if (hDDVal != DDERR_SURFACELOST && hDDVal != DD_OK) {
 			DDErrMsg(hDDVal, 3779, "C:\\Src\\Diablo\\Source\\SCROLLRT.CPP");
 		}