Compile gamemenu.cpp, track.cpp & trigs.cpp as C (#525)

This enables processing pfile.h as a C header, this adds two minor
warnings to the compile process but should be fine (game works)

MakefileVC

@@ -58,7 +58,7 @@ DIABLO_SRC += Source/render.cpp
 OBJS=$(DIABLO_SRC:.cpp=.obj)
 # hardcoded list of src files, because only some of them are ready to be compiled as C instead of C++
 # once all files compile as C we should use the /TC flag abd DIABLO_SRC instead
-DIABLO_SRC_FIXED = Source/appfat.cpp Source/automap.cpp Source/capture.cpp /TcSource/codec.cpp Source/control.cpp Source/cursor.cpp /TcSource/dead.cpp Source/debug.cpp Source/diablo.cpp Source/doom.cpp Source/drlg_l1.cpp Source/drlg_l2.cpp Source/drlg_l3.cpp Source/drlg_l4.cpp Source/dthread.cpp Source/dx.cpp Source/effects.cpp Source/encrypt.cpp Source/engine.cpp Source/error.cpp Source/fault.cpp Source/gamemenu.cpp Source/gendung.cpp Source/gmenu.cpp /TcSource/help.cpp Source/init.cpp Source/interfac.cpp Source/inv.cpp Source/items.cpp Source/lighting.cpp Source/loadsave.cpp Source/logging.cpp Source/mainmenu.cpp Source/minitext.cpp Source/missiles.cpp Source/monster.cpp Source/movie.cpp Source/mpqapi.cpp Source/msg.cpp Source/msgcmd.cpp Source/multi.cpp Source/nthread.cpp Source/objects.cpp Source/pack.cpp Source/palette.cpp /TcSource/path.cpp Source/pfile.cpp Source/player.cpp /TcSource/plrmsg.cpp /TcSource/portal.cpp Source/quests.cpp /TcSource/restrict.cpp Source/scrollrt.cpp Source/setmaps.cpp /TcSource/sha.cpp Source/sound.cpp Source/spells.cpp Source/stores.cpp Source/sync.cpp /TcSource/textdat.cpp Source/themes.cpp Source/tmsg.cpp Source/town.cpp Source/towners.cpp Source/track.cpp Source/trigs.cpp Source/wave.cpp Source/render.cpp
+DIABLO_SRC_FIXED = Source/appfat.cpp Source/automap.cpp Source/capture.cpp /TcSource/codec.cpp Source/control.cpp Source/cursor.cpp /TcSource/dead.cpp Source/debug.cpp Source/diablo.cpp Source/doom.cpp Source/drlg_l1.cpp Source/drlg_l2.cpp Source/drlg_l3.cpp Source/drlg_l4.cpp Source/dthread.cpp Source/dx.cpp Source/effects.cpp Source/encrypt.cpp Source/engine.cpp Source/error.cpp Source/fault.cpp /TcSource/gamemenu.cpp Source/gendung.cpp Source/gmenu.cpp /TcSource/help.cpp Source/init.cpp Source/interfac.cpp Source/inv.cpp Source/items.cpp Source/lighting.cpp Source/loadsave.cpp Source/logging.cpp Source/mainmenu.cpp Source/minitext.cpp Source/missiles.cpp Source/monster.cpp Source/movie.cpp Source/mpqapi.cpp Source/msg.cpp Source/msgcmd.cpp Source/multi.cpp Source/nthread.cpp Source/objects.cpp Source/pack.cpp Source/palette.cpp /TcSource/path.cpp Source/pfile.cpp Source/player.cpp /TcSource/plrmsg.cpp /TcSource/portal.cpp Source/quests.cpp /TcSource/restrict.cpp Source/scrollrt.cpp Source/setmaps.cpp /TcSource/sha.cpp Source/sound.cpp Source/spells.cpp Source/stores.cpp Source/sync.cpp /TcSource/textdat.cpp Source/themes.cpp Source/tmsg.cpp Source/town.cpp Source/towners.cpp /TcSource/track.cpp /TcSource/trigs.cpp Source/wave.cpp Source/render.cpp
 
 PKWARE_SRC=$(sort $(wildcard 3rdParty/PKWare/*.cpp))
 PKWARE_OBJS=$(PKWARE_SRC:.cpp=.obj)

Source/track.cpp

@@ -3,7 +3,6 @@
 #include "../types.h"
 
 static BYTE sgbIsScrolling;
-static float track_cpp_init_value = INFINITY;
 static DWORD sgdwLastWalk;
 static BOOL sgbIsWalking;
 

types.h

@@ -114,11 +114,7 @@ extern "C" {
 #include "Source/pack.h"
 #include "Source/palette.h"
 #include "Source/path.h"
-#ifdef __cplusplus
-}
 #include "Source/pfile.h"
-extern "C" {
-#endif
 #include "Source/player.h"
 #include "Source/plrmsg.h"
 #include "Source/portal.h"