patch 9.0.0881: cannot get the currently showing mouse shape

Problem:    Cannot get the currently showing mouse shape.
Solution:   Add getmouseshape().
diff --git a/src/evalfunc.c b/src/evalfunc.c
index 4c9ee4c..310fa78 100644
--- a/src/evalfunc.c
+++ b/src/evalfunc.c
@@ -1983,6 +1983,8 @@
 			ret_list_dict_any,  f_getmatches},
     {"getmousepos",	0, 0, 0,	    NULL,
 			ret_dict_number,    f_getmousepos},
+    {"getmouseshape",	0, 0, 0,	    NULL,
+			ret_string,	    f_getmouseshape},
     {"getpid",		0, 0, 0,	    NULL,
 			ret_number,	    f_getpid},
     {"getpos",		1, 1, FEARG_1,	    arg1_string,