Add platform defines for Windows

TODO

@@ -2,7 +2,6 @@ Windows Port TODO
 -----------------
 
 - Check WITH_SYSTEMWIDE
-- Add platform defines for Windows in common/ and game/
 - Check if we really need all the stuff in winquake.h
 - Due to a bug in MinGW the _controlfp() option defines _PC_24
   and _MCW_PC are not available. While Quake II may work without
@@ -25,7 +24,6 @@ Windows Port TODO
   And do we need it?
 - Is AppActivate() really necessary?
 - Does anisotropic filtering work under Windows?
-- Port RETEXTURING (especially jpeg) to Windows.
 - Remove leftovers from the softrenderer.
 
 The big plan:

src/common/header/common.h

@@ -39,6 +39,8 @@
 #define BUILDSTRING "Linux"
 #elif defined __FreeBSD__
 #define BUILDSTRING "FreeBSD"
+#elif defined _WIN32
+#define BUILDSTRING "Windows"
 #else
 #define BUILDSTRING "Unknown"
 #endif

src/game/savegame/savegame.c

@@ -88,6 +88,8 @@
  #define OS "FreeBSD"
 #elif defined(__linux__)
  #define OS "Linux"
+#elif defined(_WIN32)
+ #define OS "Windows"
 #else
  #define OS "Unknown"
 #endif