releng: Bug 581924: Update e4.20 target for archived CDT update site

CDT releases older than 11.0 have been archived to archive.eclipse.org.
Update targets to point to the archive location instead.

[Fixed] Bug 581924: Update e4.20 target for archived CDT update site

Change-Id: I277b6ae404fef0cbb18cce0f0cd70d903e94ba6e
Signed-off-by: Bernd Hufmann <bernd.hufmann@ericsson.com>
Reviewed-on: https://git.eclipse.org/r/c/tracecompass.incubator/org.eclipse.tracecompass.incubator/+/201822
Tested-by: Patrick Tasse <patrick.tasse@gmail.com>
Tested-by: Trace Compass Bot <tracecompass-bot@eclipse.org>
Reviewed-by: Patrick Tasse <patrick.tasse@gmail.com>

common/org.eclipse.tracecompass.incubator.target/tracecompass-incubator-e4.20.target

@@ -1,11 +1,11 @@
 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
 <?pde version="3.8"?>
-<target name="tracecompass-incubator-e4.20" sequenceNumber="4">
+<target name="tracecompass-incubator-e4.20" sequenceNumber="5">
 <locations>
 <location includeAllPlatforms="false" includeConfigurePhase="false" includeMode="planner" includeSource="true" type="InstallableUnit">
 <unit id="org.eclipse.cdt.gnu.dsf.feature.group" version="0.0.0"/>
 <unit id="org.eclipse.tm.terminal.control" version="0.0.0"/>
-<repository location="https://download.eclipse.org/tools/cdt/releases/10.3/cdt-10.3.0/"/>
+<repository location="https://archive.eclipse.org/tools/cdt/releases/10.3/cdt-10.3.0/"/>
 </location>
 <location includeAllPlatforms="false" includeConfigurePhase="false" includeMode="planner" includeSource="true" type="InstallableUnit">
 <unit id="org.eclipse.swtbot.eclipse.feature.group" version="0.0.0"/>