Revert "Bug 559641: Remove Meson until CDT's contribution includes it again"

Reenabled in https://git.eclipse.org/r/#/c/157207/

This reverts commit ddce2e96d14c0d94f43ced8a8f47b72ee19bbe99.

Change-Id: I3a01615a76ff9df09b95b2027999dcc782c02226
diff --git a/packages/org.eclipse.epp.package.cpp.product/epp.product b/packages/org.eclipse.epp.package.cpp.product/epp.product
index 4503cbd..c86f427 100644
--- a/packages/org.eclipse.epp.package.cpp.product/epp.product
+++ b/packages/org.eclipse.epp.package.cpp.product/epp.product
@@ -219,6 +219,7 @@
       <feature id="org.eclipse.cdt.qt" installMode="root"/>
       <feature id="org.eclipse.cdt.arduino" installMode="root"/>
       <feature id="org.eclipse.cdt.cmake" installMode="root"/>
+      <feature id="org.eclipse.cdt.meson" installMode="root"/>
       <feature id="org.eclipse.cdt.docker.launcher" installMode="root"/>
       <feature id="org.eclipse.cdt.debug.gdbjtag" installMode="root"/>
       <feature id="org.eclipse.cdt.debug.standalone" installMode="root"/>