SText extraction speedup.

Optimise fz_glyph_entirely_outside_box. Combine ctm and trm and
apply once, rather than applying twice. Saves ~1.9% of runtime
when extracting pdf_reference17.pdf to text.

Author: robinwatts

source/fitz/glyphbox.c

@@ -24,12 +24,12 @@
 
 int fz_glyph_entirely_outside_box(fz_context *ctx, fz_matrix *ctm, fz_text_span *span, fz_text_item *item, fz_rect *box)
 {
-	fz_rect glyph_rect = fz_bound_glyph(ctx, span->font, item->gid, span->trm);
-	glyph_rect.x0 += item->x;
-	glyph_rect.y0 += item->y;
-	glyph_rect.x1 += item->x;
-	glyph_rect.y1 += item->y;
-	glyph_rect = fz_transform_rect(glyph_rect, *ctm);
+	fz_rect glyph_rect;
+	fz_matrix trm = span->trm;
+	trm.e += item->x;
+	trm.f += item->y;
+	trm = fz_concat(trm, *ctm);
+	glyph_rect = fz_bound_glyph(ctx, span->font, item->gid, trm);
 	if (glyph_rect.x1 <= box->x0 ||
 			glyph_rect.y1 <= box->y0 ||
 			glyph_rect.x0 >= box->x1 ||