Add #pragma once to debugbreak.h and remove it from separate inclusion in a couple of translation units as we're including it directly in compat.h now

git-svn-id: https://svn.eduke32.com/eduke32@8192 1a8010ca-5511-0410-912e-c29ae57300e0

# Conflicts:
#	source/build/src/sdlayer.cpp
#	source/duke3d/src/gamedef.cpp

source/build/src/compat.cpp

@@ -4,7 +4,6 @@
 
 #define LIBDIVIDE_BODY
 #include "compat.h"
-#include "debugbreak.h"
 
 #ifdef _WIN32
 # define NEED_SHLOBJ_H

source/duke3d/src/gamedef.cpp

@@ -28,7 +28,6 @@ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 #include "common.h"
 #include "common_game.h"
 #include "crc32_.h"
-#include "debugbreak.h"
 #include "duke3d.h"
 #include "gameexec.h"
 #include "namesdyn.h"

source/duke3d/src/gameexec.cpp

@@ -26,7 +26,6 @@ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 #include "cmdline.h"
 #include "colmatch.h"
 #include "compat.h"
-#include "debugbreak.h"
 #include "duke3d.h"
 #include "input.h"
 #include "menus.h"

source/thirdparty/include/debugbreak.h

@@ -25,6 +25,8 @@
  */
 #ifndef DEBUG_BREAK_H
 
+#pragma once
+
 #ifdef _MSC_VER
 
 #define debug_break __debugbreak