Disabling org.eclipse.mylyn.github.feature for 2018-12 M3

The feature is (currently?) not available in the upstream staging
repository for 2018-12 M3.

Change-Id: I43ce4321e3815ebd496c88313effe3d171a4242c
Signed-off-by: Mikael Barbero <mikael.barbero@eclipse-foundation.org>
diff --git a/packages/org.eclipse.epp.package.javascript.product/epp.product b/packages/org.eclipse.epp.package.javascript.product/epp.product
index 46aaa91..e8fa919 100644
--- a/packages/org.eclipse.epp.package.javascript.product/epp.product
+++ b/packages/org.eclipse.epp.package.javascript.product/epp.product
@@ -203,7 +203,7 @@
       <feature id="org.eclipse.mylyn.context_feature" installMode="root"/>
       <feature id="org.eclipse.mylyn.ide_feature" installMode="root"/>
       <feature id="org.eclipse.mylyn.wikitext_feature" installMode="root"/>
-      <feature id="org.eclipse.mylyn.github.feature" installMode="root"/>
+      <!--feature id="org.eclipse.mylyn.github.feature" installMode="root"/-->
       <feature id="org.eclipse.wst.web_ui.feature" installMode="root"/>
       <feature id="org.eclipse.wst.xml_ui.feature" installMode="root"/>
       <feature id="org.eclipse.wst.json_ui.feature" installMode="root"/>
diff --git a/packages/org.eclipse.epp.package.php.product/epp.product b/packages/org.eclipse.epp.package.php.product/epp.product
index aa94b83..bbe4638 100644
--- a/packages/org.eclipse.epp.package.php.product/epp.product
+++ b/packages/org.eclipse.epp.package.php.product/epp.product
@@ -205,7 +205,7 @@
       <feature id="org.eclipse.mylyn.bugzilla_feature" installMode="root"/>
       <feature id="org.eclipse.mylyn.context_feature" installMode="root"/>
       <feature id="org.eclipse.mylyn_feature" installMode="root"/>
-      <feature id="org.eclipse.mylyn.github.feature" installMode="root"/>
+      <!--feature id="org.eclipse.mylyn.github.feature" installMode="root"/-->
       <feature id="org.eclipse.mylyn.ide_feature" installMode="root"/>
       <feature id="org.eclipse.mylyn.wikitext_feature" installMode="root"/>
       <feature id="org.eclipse.php" installMode="root"/>
diff --git a/packages/org.eclipse.epp.package.rust.product/epp.product b/packages/org.eclipse.epp.package.rust.product/epp.product
index 8525fae..08891cd 100644
--- a/packages/org.eclipse.epp.package.rust.product/epp.product
+++ b/packages/org.eclipse.epp.package.rust.product/epp.product
@@ -359,7 +359,7 @@
       <feature id="org.eclipse.mylyn.bugzilla_feature" installMode="root"/>
       <feature id="org.eclipse.mylyn.context_feature" installMode="root"/>
       <feature id="org.eclipse.mylyn_feature" installMode="root"/>
-      <feature id="org.eclipse.mylyn.github.feature" installMode="root"/>
+      <!--feature id="org.eclipse.mylyn.github.feature" installMode="root"/-->
       <feature id="org.eclipse.mylyn.ide_feature" installMode="root"/>
       <feature id="org.eclipse.mylyn.wikitext_feature" installMode="root"/>
       <feature id="org.eclipse.corrosion.feature" installMode="root"/>