Remove some additionally introduced includes and forward declarations

they are no longer needed, the code compiles just fine without.

src/c4group/C4Group.h

@@ -31,7 +31,6 @@
 #include <CStdFile.h>
 #include <StdBuf.h>
 #include <StdCompiler.h>
-#include <Standard.h>
 
 // C4Group-Rewind-warning:
 // The current C4Group-implementation cannot handle random file access very well,

src/graphics/C4Draw.h

@@ -37,7 +37,7 @@
 #define GFXENGN_NOGFX    3
 
 // Global Draw access pointer
-extern class C4Draw *pDraw;
+extern C4Draw *pDraw;
 
 // rotation info class
 class C4BltTransform

src/graphics/C4Surface.h

@@ -25,8 +25,6 @@
 
 #include <StdColors.h>
 #include <C4Rect.h>
-#include <C4Group.h>
-#include <C4GroupSet.h>
 
 #ifdef _WIN32
 #include <C4windowswrapper.h>
@@ -74,10 +72,6 @@ class CStdGLCtx;
 extern CStdGL *pGL;
 #endif
 
-class C4AbstractApp;
-class C4Window;
-class C4TexRef;
-
 class C4Surface
 {
 private:

src/lib/C4Real.h

@@ -40,9 +40,6 @@
 
 #include <math.h>
 
-#include "PlatformAbstraction.h"
-#include "StdCompiler.h"
-
 // activate to switch to classic fixed-point math
 #define C4REAL_USE_FIXNUM 1
 #define inline ALWAYS_INLINE

src/platform/StdSync.h

@@ -22,8 +22,6 @@
 #ifndef INC_StdSync
 #define INC_StdSync
 
-#include <PlatformAbstraction.h>
-
 #ifdef _WIN32
 #include <C4windowswrapper.h>