patch 8.0.0818: cannot get the cursor position of a terminal

Problem:    Cannot get the cursor position of a terminal.
Solution:   Add term_getcursor().
diff --git a/src/proto/terminal.pro b/src/proto/terminal.pro
index 6f5b3ab..63cda59 100644
--- a/src/proto/terminal.pro
+++ b/src/proto/terminal.pro
@@ -16,6 +16,7 @@
 char_u *term_get_status_text(term_T *term);
 int set_ref_in_term(int copyID);
 void f_term_getattr(typval_T *argvars, typval_T *rettv);
+void f_term_getcursor(typval_T *argvars, typval_T *rettv);
 void f_term_getjob(typval_T *argvars, typval_T *rettv);
 void f_term_getline(typval_T *argvars, typval_T *rettv);
 void f_term_getsize(typval_T *argvars, typval_T *rettv);