secur32: Remove hardcoded assumption that the SECBUFFER_DATA is always at index 1 for en/decrypting.

user32/tests: Compare against ASCII string first since it may not be a valid Unicode string in that case.

wined3d: CreateFakeGLContxt/ReleaseFakeGLContext doesn't need ENTER_GL/LEAVE_GL and they are making GDI calls.

The removal of ENTER_GL from the fake context code, requires the
addition of ENTER_GL/LEAVE_GL to FillGLCaps which was protected by the
fake context code before.