Fix some warnings. Disable warning about invalid offsetof as it produces billion warnings in save-restore code

dlls/CMakeLists.txt

@@ -1,4 +1,4 @@
-#
+#
 # Copyright (c) 2015 Pavlo Lavrenenko
 #
 # Permission is hereby granted, free of charge, to any person obtaining a copy
@@ -28,7 +28,7 @@ set (SVDLL_LIBRARY server)
 add_definitions(-DCLIENT_WEAPONS)
 
 if(NOT MSVC)
-	add_compile_options(-fno-exceptions) # GCC/Clang flag
+	add_compile_options(-fno-exceptions -Wno-invalid-offsetof) # GCC/Clang flag
 	add_definitions(-D_LINUX) # It seems enough for all non-Win32 systems
 	add_definitions(-Dstricmp=strcasecmp -Dstrnicmp=strncasecmp -D_snprintf=snprintf -D_vsnprintf=vsnprintf )
 else()

dlls/playermonster.cpp

@@ -1,4 +1,4 @@
-//========= Copyright © 1996-2002, Valve LLC, All rights reserved. ============
+//========= Copyright © 1996-2002, Valve LLC, All rights reserved. ============
 //
 // Purpose: New version of the slider bar
 //
@@ -82,7 +82,7 @@ void CPlayerMonster :: HandleAnimEvent( MonsterEvent_t *pEvent )
 //=========================================================
 int CPlayerMonster::ISoundMask( void )
 {
-	return NULL;
+	return 0;
 }
 
 //=========================================================

utils/false_vgui/include/VGUI_Panel.h

@@ -219,7 +219,6 @@ private:
 	bool                _paintBorderEnabled;
 	bool                _paintBackgroundEnabled;
 	bool                _paintEnabled;
-friend class Panel;
 friend class App;
 friend class SurfaceBase;
 friend class Image;