add check for missing glyph in XftFontCheckGlyph()

Thomas E. Dickey requested to merge dickey/libxft:check-missing-glyph into master

This check is needed when updating the linked list of glyphs, since the older/newer links are not set, causing an xterm crash for certain fonts which have holes (e.g., Kochi Mincho).

reported by Jeff Chua

Signed-off-by: Thomas E. Dickey

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