reduce linker memory in an attempt to make the builds pass on Launchpad

Gbp-Pq: Name reduce-linker-memory.patch

node.gyp

@@ -1308,6 +1308,9 @@
             'Ws2_32.lib',
           ],
         }],
+        ['(target_arch=="ppc64" or target_arch=="arm" or target_arch=="arm64")', {
+          'ldflags': [ '-Wl,--no-keep-memory' ],
+        }],
       ],
     }, # node_mksnapshot
   ], # end targets