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libttf: add missing file impl.h

--- /dev/null

+++ b/sys/src/libttf/impl.h

@@ -1,0 +1,17 @@

+enum {

+	ONCURVE = 1,

+	TOUCHX = 2,

+	TOUCHY = 4,

+	TOUCH = 6,

+};

+

+int ttfgototable(TTFontU *, char *);

+int ttfrounddiv(int, int);

+int ttfvrounddiv(vlong, int);

+int ttfhint(TTGlyph *);

+int ttfparsecmap(TTFontU *);

+int ttfrunfpgm(TTFont *);

+int ttfruncvt(TTFont *);

+void ttfunpack(TTFontU *, char *, ...);

+void ttfscan(TTGlyph *);

+void ttffreebitmap(TTBitmap *);