[show_text_glyphs] Replace the bool backward with cairo_text_cluster_flags

Chris rightfully complained that having a boolean function argument is
new in cairo_show_text_glyphs, and indeed avoiding them has been one
of the API design criteria for cairo.  Trying to come up with alternatives,
Owen suggested using a flag type which nicely solves the problem AND
future-proofs such a complex API.

Please welcome _flags_t APIs to cairo.h

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