palette recalc check for some vector games

src/burn/drv/pre90s/d_bzone.cpp

@@ -818,8 +818,11 @@ static void DrvPaletteInit()
 
 static INT32 DrvDraw()
 {
-	DrvPaletteInit();
-//	extern int counter;
+	if (DrvRecalc) {
+		DrvPaletteInit();
+		DrvRecalc = 0;
+	}
+
 	vector_set_clip(0x20, nScreenWidth-0x20, 0, nScreenHeight);
 
 	draw_vector(DrvPalette);

src/burn/drv/pre90s/d_jedi.cpp

@@ -644,7 +644,7 @@ static INT32 DrvDraw()
 {
 	if (DrvRecalc) {
 		DrvPaletteUpdate();
-		DrvRecalc = 1; // force update
+		DrvRecalc = 1; // force update (palram)
 	}
 
 	BurnTransferClear();

src/burn/drv/pre90s/d_starwars.cpp

@@ -982,7 +982,10 @@ static void DrvPaletteInit()
 
 static INT32 DrvDraw()
 {
-	DrvPaletteInit();
+	if (DrvRecalc) {
+		DrvPaletteInit();
+		DrvRecalc = 0;
+	}
 
 	draw_vector(DrvPalette);
 

src/burn/drv/pre90s/d_tempest.cpp

@@ -443,7 +443,10 @@ static void DrvPaletteInit()
 
 static INT32 DrvDraw()
 {
-	DrvPaletteInit();
+	if (DrvRecalc) {
+		DrvPaletteInit();
+		DrvRecalc = 0;
+	}
 
 	draw_vector(DrvPalette);