Revert "Update versions of the Eclipse prebuilt libraries"

This reverts commit 94c85043c18a62dd3fc53a4f15faa9b08aeccc52.
diff --git a/core/user_tags.mk b/core/user_tags.mk
index 4c0710f..325c600 100644
--- a/core/user_tags.mk
+++ b/core/user_tags.mk
@@ -416,6 +416,9 @@
 	oauth \
 	obbtool \
 	omx_tests \
+	org.eclipse.core.commands_3.4.0.I20080509-2000 \
+	org.eclipse.equinox.common_3.4.0.v20080421-2006 \
+	org.eclipse.jface_3.4.2.M20090107-0800 \
 	org-netbeans-api-visual \
 	org-openide-util \
 	osgi \
diff --git a/target/product/sdk.mk b/target/product/sdk.mk
index 6bd685c..5059950 100644
--- a/target/product/sdk.mk
+++ b/target/product/sdk.mk
@@ -110,9 +110,9 @@
 	jcommon-1.0.12 \
 	jfreechart-1.0.9 \
 	jfreechart-1.0.9-swt \
-	org.eclipse.core.commands_3.6.0.I20100512-1500 \
-	org.eclipse.equinox.common_3.6.0.v20100503 \
-	org.eclipse.jface_3.6.2.M20110210-1200 \
+	org.eclipse.core.commands_3.4.0.I20080509-2000 \
+	org.eclipse.equinox.common_3.4.0.v20080421-2006 \
+	org.eclipse.jface_3.4.2.M20090107-0800 \
 	osgi \
 	layoutlib \
 	lint \