Bump to 50ad171.

remove workaround for a crash with color emojis on some systems, now fixed in libXft 2.3.5

https://gitlab.freedesktop.org/xorg/lib/libxft/-/blob/libXft-2.3.5/NEWS

bump version to 6.4

Ref.
https://git.suckless.org/dwm/commit/970f37697358574e127019eb0ee2f5725ec05ce0.html
https://git.suckless.org/dwm/commit/50ad171eea9db5ccb36fce2592e047c3282975ff.html

Consequently the color emoji patch has been inverted into no color emoji, keeping the workaround in the code base for those that are on systems with older versions of the Xft library.

drw.c

@@ -237,7 +237,7 @@ xfont_create(Drw *drw, const char *fontname, FcPattern *fontpattern)
 		die("no font specified.");
 	}
 
-	#if !BAR_COLOR_EMOJI_PATCH
+	#if BAR_NO_COLOR_EMOJI_PATCH
 	/* Do not allow using color fonts. This is a workaround for a BadLength
 	 * error from Xft with color glyphs. Modelled on the Xterm workaround. See
 	 * https://bugzilla.redhat.com/show_bug.cgi?id=1498269
@@ -250,7 +250,7 @@ xfont_create(Drw *drw, const char *fontname, FcPattern *fontpattern)
 		XftFontClose(drw->dpy, xfont);
 		return NULL;
 	}
-	#endif // BAR_COLOR_EMOJI_PATCH
+	#endif // BAR_NO_COLOR_EMOJI_PATCH
 
 	font = ecalloc(1, sizeof(Fnt));
 	font->xfont = xfont;
@@ -592,7 +592,9 @@ drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, unsigned int lp
 			fcpattern = FcPatternDuplicate(drw->fonts->pattern);
 			FcPatternAddCharSet(fcpattern, FC_CHARSET, fccharset);
 			FcPatternAddBool(fcpattern, FC_SCALABLE, FcTrue);
+			#if BAR_NO_COLOR_EMOJI_PATCH
 			FcPatternAddBool(fcpattern, FC_COLOR, FcFalse);
+			#endif // BAR_NO_COLOR_EMOJI_PATCH
 
 			FcConfigSubstitute(NULL, fcpattern, FcMatchPattern);
 			FcDefaultSubstitute(fcpattern);