pango: upgrade to 0230520-e81f17d

This upgrades the pango patch to:
https://dwm.suckless.org/patches/pango/dwm-pango-20230520-e81f17d.diff

The changes are fixes for some vertical alignment issues that were obvious only for CJK fonts.

The implementation in dwm-flexipatch is still simplified compared to the original patch, e.g.
avoiding changes like drw->fonts to drw->font and many similar function signatures.

drw.c

@@ -436,10 +436,10 @@ drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, unsigned int lp
 {
 #if BAR_PANGO_PATCH
 	char buf[1024];
-	int ty;
-	unsigned int ew;
+	int i, ty, th;
+	unsigned int ew, eh;
 	XftDraw *d = NULL;
-	size_t i, len;
+	size_t len;
 	int render = x || y || w || h;
 
 	if (!drw || (render && !drw->scheme) || !text || !drw->fonts)
@@ -464,10 +464,14 @@ drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, unsigned int lp
 	len = strlen(text);
 
 	if (len) {
-		drw_font_getexts(drw->fonts, text, len, &ew, NULL, markup);
+		drw_font_getexts(drw->fonts, text, len, &ew, &eh, markup);
+		th = eh;
 		/* shorten text if necessary */
-		for (len = MIN(len, sizeof(buf) - 1); len && ew > w; len--)
-			drw_font_getexts(drw->fonts, text, len, &ew, NULL, markup);
+		for (len = MIN(len, sizeof(buf) - 1); len && ew > w; len--) {
+			drw_font_getexts(drw->fonts, text, len, &ew, &eh, markup);
+			if (eh > th)
+				th = eh;
+		}
 
 		if (len) {
 			memcpy(buf, text, len);
@@ -477,7 +481,7 @@ drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, unsigned int lp
 					; /* NOP */
 
 			if (render) {
-				ty = y + (h - drw->fonts->h) / 2;
+				ty = y + (h - th) / 2;
 				if (markup)
 					pango_layout_set_markup(drw->fonts->layout, buf, len);
 				else