patch 8.0.0661: recognizing urxvt mouse codes does not work well

Problem:    Recognizing urxvt mouse codes does not work well.
Solution:   Recognize "Esc[*M" and "Esc[*m". (Maurice Bos, closes #1486)
diff --git a/src/misc2.c b/src/misc2.c
index fa06e47..7014e16 100644
--- a/src/misc2.c
+++ b/src/misc2.c
@@ -2438,6 +2438,7 @@
 #endif
 #ifdef FEAT_MOUSE_SGR
     {K_SGR_MOUSE,	(char_u *)"SgrMouse"},
+    {K_SGR_MOUSERELEASE, (char_u *)"SgrMouseRelelase"},
 #endif
     {K_LEFTMOUSE,	(char_u *)"LeftMouse"},
     {K_LEFTMOUSE_NM,	(char_u *)"LeftMouseNM"},