patch 8.2.2275: CTRL-C not recognized in Mintty

Problem:    CTRL-C not recognized in Mintty.
Solution:   Recognize the modifyOtherKeys code ending in "u". (Christian
            Brabandt, closes #7575)
diff --git a/src/ui.c b/src/ui.c
index 7c86675..d29c26d 100644
--- a/src/ui.c
+++ b/src/ui.c
@@ -1014,11 +1014,14 @@
 	{
 	    /*
 	     * If a CTRL-C was typed, remove it from the buffer and set
-	     * got_int.  Also recognize CTRL-C with modifyOtherKeys set.
+	     * got_int.  Also recognize CTRL-C with modifyOtherKeys set, in two
+	     * forms.
 	     */
 	    if (ctrl_c_interrupts && (inbuf[inbufcount] == 3
 			|| (len >= 9 && STRNCMP(inbuf + inbufcount,
-						   "\033[27;5;99~", 10) == 0)))
+						   "\033[27;5;99~", 10) == 0)
+			|| (len >= 7 && STRNCMP(inbuf + inbufcount,
+						       "\033[99;5u", 7) == 0)))
 	    {
 		// remove everything typed before the CTRL-C
 		mch_memmove(inbuf, inbuf + inbufcount, (size_t)(len + 1));