Add line width calculations for 15/16 and 24/32 bit modes in case the "Get Scan Line Length" function fails, as it does in Parallels (in Version 2.2, Build 2112 at least).
Add line width calculations for 15/16 and 24/32 bit modes in case
the "Get Scan Line Length" function fails, as it does in Parallels
(in Version 2.2, Build 2112 at least).

PR:		i386/127367
Obtained from:	DragonFly
Submitted by:	Pedro Giffuni
MFC after:	1 month

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