anv: remove define _DEFAULT_SOURCE

The build systems already add this as applicable. There's no need to
have this in the source file.

Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>

src/intel/vulkan/anv_allocator.c

@@ -21,8 +21,6 @@
  * IN THE SOFTWARE.
  */
 
-#define _DEFAULT_SOURCE
-
 #include <stdint.h>
 #include <stdlib.h>
 #include <unistd.h>

src/intel/vulkan/anv_gem.c

@@ -21,8 +21,6 @@
  * IN THE SOFTWARE.
  */
 
-#define _DEFAULT_SOURCE
-
 #include <sys/ioctl.h>
 #include <sys/mman.h>
 #include <string.h>

src/intel/vulkan/anv_gem_stubs.c

@@ -21,8 +21,6 @@
  * IN THE SOFTWARE.
  */
 
-#define _DEFAULT_SOURCE
-
 #include <linux/memfd.h>
 #include <sys/mman.h>
 #include <sys/syscall.h>