Revert #if changes

I changed some "#ifdef"s to "#if defined"s by mistake, so I reverted them.

* src/alloc.c: Reverted.
(garbage_collect): Reverted.
* src/emacs.c (main): Reverted.
* src/image.c (xpm_load_image): Reverted.
(image_disable_image): Reverted.
(image_build_heuristic_mask): Reverted.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/alloc.c b/src/alloc.c
index 2d25f8205ae..9388cf1d08f 100644
--- a/src/alloc.c
+++ b/src/alloc.c
@@ -96,7 +96,7 @@ along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.  */
 #include <unistd.h>
 #include <fcntl.h>
 
-#if defined(USE_GTK)
+#ifdef USE_GTK
 # include "gtkutil.h"
 #endif
 #ifdef WINDOWSNT
@@ -6148,7 +6148,7 @@ garbage_collect (void)
   mark_pgtkterm();
 #endif
 
-#if defined(USE_GTK)
+#ifdef USE_GTK
   xg_mark_data ();
 #endif