Fix some C symbol extern visibility

Make some C symbols static if they don’t need to be extern.
Also, remove a couple of functions that were discovered to be
unused as a result of this process, and mark two extern
functions intended to be usable from GDB.
* src/buffer.c (previous_overlay_change):
* src/composite.c (composition_lisp_table):
* src/fileio.c (file_name_directory):
* src/frame.c (check_tty):
* src/insdel.c (adjust_markers_for_insert):
* src/keyboard.c (unread_switch_frame, read_char)
(requeued_events_pending_p):
* src/sysdep.c (renameat_noreplace) [!HAVE_ANDROID]:
* src/textconv.c (get_conversion_field) [!HAVE_ANDROID]:
* src/treesit.c (TREESIT_BOB_LINECOL, TREESIT_TS_POINT_1_0)
(treesit_buf_tracks_linecol_p, make_treesit_parser)
(make_treesit_node):
* src/xdisp.c (x_y_to_hpos_vpos):
* src/xfaces.c (load_color) [!MSDOS]:
* src/xfns.c (x_real_pos_and_offsets):
* src/xterm.c (x_dnd_do_unsupported_drop):
Now static.  Move up if necessary.
* src/coding.c (utf8_string_p):
* src/keyboard.c (detect_input_pending_ignore_squeezables):
Remove; unused.
* src/frame.c (gui_set_alpha):
* src/textconv.c (start_batch_edit, end_batch_edit, commit_text)
(finish_composing_text, set_composing_text)
(set_composing_region, textconv_set_point_and_mark)
(delete_surrounding_text, request_point_update)
(textconv_barrier, replace_text, get_extracted_text)
(get_surrounding_text):
* src/xdisp.c (gui_union_rectangles):
* src/xterm.c (xi_frame_selected_for):
Define only if needed.
* src/treesit.c (treesit_debug_print_parser_list)
(treesit_debug_print_linecol): Declare EXTERNALLY_VISIBLE.
* src/xdisp.c (x_y_to_column_row): New function, defined
only if needed.  All external callers to x_y_to_hpos_vpos changed.

1 files changed, 6 insertions, 0 deletions

diff --git a/src/textconv.c b/src/textconv.c
index 105a8077072..e5ade79895c 100644
--- a/src/textconv.c
+++ b/src/textconv.c
@@ -1743,6 +1743,9 @@ handle_pending_conversion_events (void)
    F should be constrained in *BEG and *END.  Should no field be active,
    set *END to PTRDIFF_MAX.  */
 
+#ifndef HAVE_ANDROID
+static
+#endif
 void
 get_conversion_field (struct frame *f, ptrdiff_t *beg, ptrdiff_t *end)
 {
@@ -1772,6 +1775,8 @@ get_conversion_field (struct frame *f, ptrdiff_t *beg, ptrdiff_t *end)
   *end = PTRDIFF_MAX;
 }
 
+#ifdef HAVE_ANDROID
+
 /* Start a ``batch edit'' in frame F.  During a batch edit,
    point_changed will not be called until the batch edit ends.
 
@@ -2307,6 +2312,7 @@ get_surrounding_text (struct frame *f, ptrdiff_t left,
   unbind_to (count, Qnil);
   return buffer;
 }
+#endif /* HAVE_ANDROID */
 
 /* Return whether or not text conversion is temporarily disabled.
    `reset' should always call this to determine whether or not to