opengl32: Use wrappers for wglCreateContext and wglMakeCurrent instead of directly forwarding to gdi32.

user32: Only attempt autoscroll line breaking on an edit control when we have a reasonable width to break to.

This saves a needless matrix multiplication and is actually more obvious than
the glOrtho() call.

Thanks to Octavian Voicu.

user32: Early versions of usp10 are not well behaved with ScriptString_pSize when SCRIPT_STRING_ANALYSIS is NULL.