FindSDL: Add additional search paths on MSVC (#14029)

Add an architecture-specific library directory path suffix for each
component.  Use different search path for SDL_sound.  Project files in
VisualC directory suggest that a win32lib will hold the libraries.

Reported-by: Paul Hampson <Paul.Hampson@Pobox.com>
Merge topic 'FixIssue14029' into next

9619719 FindSDL: Add additional search paths on MSVC (#14029)