make GLUT optional in cmake

fix for btMultiBody to avoid extreme energy gain

src/Bullet3Geometry/CMakeLists.txt

@@ -0,0 +1,44 @@
+
+INCLUDE_DIRECTORIES(
+	${BULLET_PHYSICS_SOURCE_DIR}/src
+)
+
+SET(Bullet3Geometry_SRCS
+	b3ConvexHullComputer.cpp
+	b3GeometryUtil.cpp
+)
+
+SET(Bullet3Geometry_HDRS
+	b3AabbUtil.h
+	b3ConvexHullComputer.h
+	b3GeometryUtil.h
+	b3GrahamScan2dConvexHull.h
+)
+
+ADD_LIBRARY(Bullet3Geometry ${Bullet3Geometry_SRCS} ${Bullet3Geometry_HDRS})
+SET_TARGET_PROPERTIES(Bullet3Geometry PROPERTIES VERSION ${BULLET_VERSION})
+SET_TARGET_PROPERTIES(Bullet3Geometry PROPERTIES SOVERSION ${BULLET_VERSION})
+
+IF (INSTALL_LIBS)
+	IF (NOT INTERNAL_CREATE_DISTRIBUTABLE_MSVC_PROJECTFILES)
+		#FILES_MATCHING requires CMake 2.6
+		IF (${CMAKE_MAJOR_VERSION}.${CMAKE_MINOR_VERSION} GREATER 2.5)
+			IF (APPLE AND BUILD_SHARED_LIBS AND FRAMEWORK)
+				INSTALL(TARGETS Bullet3Geometry DESTINATION .)
+			ELSE (APPLE AND BUILD_SHARED_LIBS AND FRAMEWORK)
+				INSTALL(TARGETS Bullet3Geometry 
+					RUNTIME DESTINATION bin
+					LIBRARY DESTINATION lib${LIB_SUFFIX}
+					ARCHIVE DESTINATION lib${LIB_SUFFIX})
+				INSTALL(DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
+DESTINATION ${INCLUDE_INSTALL_DIR} FILES_MATCHING PATTERN "*.h"  PATTERN
+".svn" EXCLUDE PATTERN "CMakeFiles" EXCLUDE)
+			ENDIF (APPLE AND BUILD_SHARED_LIBS AND FRAMEWORK)
+		ENDIF (${CMAKE_MAJOR_VERSION}.${CMAKE_MINOR_VERSION} GREATER 2.5)
+
+		IF (APPLE AND BUILD_SHARED_LIBS AND FRAMEWORK)
+			SET_TARGET_PROPERTIES(Bullet3Geometry PROPERTIES FRAMEWORK true)
+			SET_TARGET_PROPERTIES(Bullet3Geometry PROPERTIES PUBLIC_HEADER "${Bullet3Geometry_HDRS}")
+		ENDIF (APPLE AND BUILD_SHARED_LIBS AND FRAMEWORK)
+	ENDIF (NOT INTERNAL_CREATE_DISTRIBUTABLE_MSVC_PROJECTFILES)
+ENDIF (INSTALL_LIBS)