msvcp90: Convert characters to unsigned char before passing them to functions operating on integers.

This reverts commit 53806917.
Tests show that this is allowed.

krnl386.exe: If we use operands order of AT&T asm syntax, we'd better use % for registers as in winedbg and GNU assembler to avoid confusion.

wined3d: Move shader_is_pshader_version() and shader_is_vshader_version() to the ARB program shader backend.