src/*.c: Silence a few warnings about unused vars and functions.

* src/image.c (x_bitmap_height, x_bitmap_width) [HAVE_X_WINDOWS]:
* src/sysdep.c (reset_sigio) [!DOS_NT]: Declare conditionally.

* src/keyboard.c (read_decoded_event_from_main_queue): #ifdef out
  variables on Windows.

* src/w32.c (unsetenv): Remove unused var `retval'.
  (emacs_gnutls_pull): Remove unused vars `fdset' and `timeout'.

* src/w32fns.c (Ffile_system_info): Use parenthesis in and/or expression.

* src/w32notify.c (watch_worker): Remove unnecesary var sleep_result.
  (start_watching): Remove unused var `thr'.

* src/w32proc.c (sys_spawnve): Comment out unused vars `first', `last'.
  (find_child_console): Remove unnecesary var `thread_id'.

* src/w32term.c (w32_read_socket): Comment out unused vars `row', `columns'.
  (x_focus_frame): #ifdef 0 unused variable `dpyinfo'.

1 files changed, 2 insertions, 0 deletions

diff --git a/src/image.c b/src/image.c
index d6d5ace509d..6b33e1de8a1 100644
--- a/src/image.c
+++ b/src/image.c
@@ -160,6 +160,7 @@ XPutPixel (XImagePtr ximage, int x, int y, unsigned long pixel)
 
 /* Functions to access the contents of a bitmap, given an id.  */
 
+#ifdef HAVE_X_WINDOWS
 static int
 x_bitmap_height (struct frame *f, ptrdiff_t id)
 {
@@ -171,6 +172,7 @@ x_bitmap_width (struct frame *f, ptrdiff_t id)
 {
   return FRAME_DISPLAY_INFO (f)->bitmaps[id - 1].width;
 }
+#endif
 
 #if defined (HAVE_X_WINDOWS) || defined (HAVE_NTGUI)
 ptrdiff_t