patch 9.0.0513: may not be able to use a pattern ad the debug prompt

Problem:    May not be able to use a pattern ad the debug prompt.
Solution:   Temporarily disable the timeout. (closes #11164)
diff --git a/src/proto/regexp.pro b/src/proto/regexp.pro
index 3fd91ee..ffd5a07 100644
--- a/src/proto/regexp.pro
+++ b/src/proto/regexp.pro
@@ -1,6 +1,8 @@
 /* regexp.c */
 void init_regexp_timeout(long msec);
 void disable_regexp_timeout(void);
+void save_timeout_for_debugging(void);
+void restore_timeout_for_debugging(void);
 int re_multiline(regprog_T *prog);
 char_u *skip_regexp(char_u *startp, int delim, int magic);
 char_u *skip_regexp_err(char_u *startp, int delim, int magic);