32-bit number is used to make 64-bit mask

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MSVC 8 thinks that 32-bit type is unlikely to be suitable to make 64-nit
mask. I tend to agree but the owner's review is appreciated.

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Index: gs/base/gdevplnx.c
===================================================================
--- gs/base/gdevplnx.c	(revision 9301)
+++ gs/base/gdevplnx.c	(working copy)
@@ -183,7 +183,7 @@
 		ppdc->colors.colored.c_base[i] = 0;
 		ppdc->colors.colored.c_level[i] = 0;
 	    }
-	ppdc->colors.colored.plane_mask &= 1 << plane;
+	ppdc->colors.colored.plane_mask &= (gx_color_index)1 << plane;
 	if (ppdc->colors.colored.c_level[plane] == 0) {
 	    gx_devn_reduce_colored_halftone(ppdc, (gx_device *)edev);
 	    ppdc->colors.pure = COLOR_PIXEL(edev, ppdc->colors.pure);

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