patch 8.2.4040: keeping track of allocated lines is too complicated

Problem:    Keeping track of allocated lines in user functions is too
            complicated.
Solution:   Instead of freeing individual lines keep them all until the end.
diff --git a/src/proto/alloc.pro b/src/proto/alloc.pro
index 2069ca8..18281ad 100644
--- a/src/proto/alloc.pro
+++ b/src/proto/alloc.pro
@@ -17,10 +17,11 @@
 void ga_clear_strings(garray_T *gap);
 int ga_copy_strings(garray_T *from, garray_T *to);
 void ga_init(garray_T *gap);
-void ga_init2(garray_T *gap, int itemsize, int growsize);
+void ga_init2(garray_T *gap, size_t itemsize, int growsize);
 int ga_grow(garray_T *gap, int n);
 int ga_grow_inner(garray_T *gap, int n);
 char_u *ga_concat_strings(garray_T *gap, char *sep);
+int ga_copy_string(garray_T *gap, char_u *p);
 int ga_add_string(garray_T *gap, char_u *p);
 void ga_concat(garray_T *gap, char_u *s);
 void ga_concat_len(garray_T *gap, char_u *s, size_t len);