Enabled building under BeOS, and fixed the build under R5.

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@15702 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/preferences/screen/Jamfile

@@ -1,5 +1,6 @@
 SubDir HAIKU_TOP src preferences screen ;
 
+SetSubDirSupportedPlatformsBeOSCompatible ;
 AddSubDirSupportedPlatforms libbe_test ;
 
 UsePrivateHeaders [ FDirName graphics radeon ] ;

src/preferences/screen/MonitorView.cpp

@@ -125,6 +125,16 @@ MonitorView::SetResolution(int32 width, int32 height)
 }
 
 
+#ifdef HAIKU_TARGET_PLATFORM_BEOS
+// r5 doesn't have this one
+bool
+operator!=(const rgb_color &a, const rgb_color &b)
+{
+	return a.red != b.red || a.green != b.green || a.blue != b.blue;
+}
+#endif
+
+
 void
 MonitorView::MessageReceived(BMessage* message)
 {