patch 8.2.0674: some source files are too big

Problem:    Some source files are too big.
Solution:   Move text formatting functions to a new file. (Yegappan
            Lakshmanan, closes #6021)
diff --git a/src/proto/getchar.pro b/src/proto/getchar.pro
index 0382122..9ff6620 100644
--- a/src/proto/getchar.pro
+++ b/src/proto/getchar.pro
@@ -19,6 +19,7 @@
 void stuffReadbuffSpec(char_u *s);
 void stuffcharReadbuff(int c);
 void stuffnumReadbuff(long n);
+void stuffescaped(char_u *arg, int literally);
 int start_redo(long count, int old_redo);
 int start_redo_ins(void);
 void stop_redo_ins(void);