[SDL] Patch: SDL_SoftStretch segfault fix

[Gerry JJ]

Hi.  When SDL_SoftStretch assembly code is enabled, SDL doesn't make
the code it generates executable, which results in a segfault on some
machines when calling that code.  The attached patch (against SDL
1.2.12) fixes this by using mprotect to make the copy_rows buffer
executable.  This also requires the buffer to be page-aligned.

Unfortunately the patch is a bit posix-specific though, as I don't know
the right way to do this in Windows etc (does it have mprotect?), so
the patch probably needs some tweaking before it can be committed.

- Gerry
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