patch 8.2.3301: memory allocation functions don't have their own place

Problem:    Memory allocation functions don't have their own place.
Solution:   Move memory allocation functions to alloc.c.  (Yegappan
            Lakshmanan, closes #8717)
diff --git a/src/proto/misc2.pro b/src/proto/misc2.pro
index a9e2b84..e342021 100644
--- a/src/proto/misc2.pro
+++ b/src/proto/misc2.pro
@@ -19,35 +19,8 @@
 void check_cursor(void);
 void adjust_cursor_col(void);
 int leftcol_changed(void);
-void vim_mem_profile_dump(void);
-int alloc_does_fail(size_t size);
-void *alloc(size_t size);
-void *alloc_id(size_t size, alloc_id_T id);
-void *alloc_clear(size_t size);
-void *alloc_clear_id(size_t size, alloc_id_T id);
-void *lalloc_clear(size_t size, int message);
-void *lalloc(size_t size, int message);
-void *lalloc_id(size_t size, int message, alloc_id_T id);
-void *mem_realloc(void *ptr, size_t size);
-void do_outofmem_msg(size_t size);
-void free_all_mem(void);
-char_u *vim_memsave(char_u *p, size_t len);
 int copy_option_part(char_u **option, char_u *buf, int maxlen, char *sep_chars);
-void vim_free(void *x);
 int vim_isspace(int x);
-void ga_clear(garray_T *gap);
-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);
-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_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);
-void ga_append(garray_T *gap, int c);
-void append_ga_line(garray_T *gap);
 int simplify_key(int key, int *modifiers);
 int handle_x_keys(int key);
 char_u *get_special_key_name(int c, int modifiers);
@@ -75,6 +48,7 @@
 void update_mouseshape(int shape_idx);
 int vim_chdir(char_u *new_dir);
 int get_user_name(char_u *buf, int len);
+void free_username(void);
 int filewritable(char_u *fname);
 int get2c(FILE *fd);
 int get3c(FILE *fd);