tests/direct_mode: Fix OpenGL direct mode test build

src/tests/kits/opengl/direct_mode/Jamfile

@@ -1,25 +1,22 @@
 SubDir HAIKU_TOP src tests kits opengl direct_mode ;
 UseBuildFeatureHeaders mesa ;
-
+UseBuildFeatureHeaders glu ;
-SetSubDirSupportedPlatformsBeOSCompatible ;
-
-if $(TARGET_PLATFORM) != haiku {
-	# Needed for <GL/glut.h>, not present in R5.
-	# Unfortunately we also get the other headers there,
-	# that we don't really want.
-	UsePublicHeaders opengl ;
-}
 
 local sources =
 	GLDirectMode.cpp
 ;
 
-Includes [ FGristFiles $(sources) ] : [ BuildFeatureAttribute mesa : headers ] ;
+Includes [ FGristFiles $(sources) ]
+	:
+	[ BuildFeatureAttribute mesa : headers ]
+	[ BuildFeatureAttribute glu : headers ]
+;
 
 SimpleTest GLDirectMode :
 	$(sources)
 	:
 	be game $(TARGET_LIBSUPC++)
 	[ BuildFeatureAttribute mesa : library ]
+	[ BuildFeatureAttribute glu : library ]
 	: GLDirectMode.rdef
 ;