Fixes to build under MinGW

thanks to Mikhail, http://code.google.com/p/bullet/issues/detail?id=352

CMakeLists.txt

@@ -122,10 +122,10 @@ ADD_DEFINITIONS( -D_CRT_SECURE_NO_WARNINGS )
 ADD_DEFINITIONS( -D_CRT_SECURE_NO_DEPRECATE )
 ADD_DEFINITIONS( -D_SCL_SECURE_NO_WARNINGS )
 
-IF (USE_GLUT)
+IF (USE_GLUT AND MSVC)
         string (REPLACE "/D_WINDOWS" "" CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS})
         remove_definitions(-D_WINDOWS )
-ENDIF (USE_GLUT)
+ENDIF()
 
 ELSE(WIN32)
 OPTION(USE_GLUT "Use Glut"	ON)

Extras/Serialize/BulletFileLoader/bChunk.h

@@ -17,7 +17,7 @@ subject to the following restrictions:
 #define __BCHUNK_H__
 
 
-#ifdef _WIN32
+#if defined (_WIN32) && ! defined (__MINGW32__)
 	#define long64 __int64
 #else
 	#define long64 long long