user32: Make sure our vertical line count is at least 1 even if there is an oversized font in the edit control.

rsaenh: Add a value to the empty braces in the initialiser for aOIDDescriptor in build_hash_signature.

An empty initialiser isn't supported on some compilers like MSVC.

wined3d: We only need to enable texturing for a target if we're going to draw with it (without a shader).

Also, these enables cause problems if they're done while the context
is setup for blitting.

user32: DrawText handling of 0 counts with string, empty strings and -1 counts with empty string and NULL strings.