Remove "no valid plugin descriptors were found" build-time warning
Remove "no valid plugin descriptors were found" build-time warning

vlsi/calcite,looker-open-source/calcite,julianhyde/calcite,vlsi/calcite,looker-open-source/calcite,looker-open-source/calcite,vlsi/calcite,vlsi/incubator-calcite,apache/calcite,apache/calcite,vlsi/incubator-calcite,looker-open-source/calcite,apache/calcite,vlsi/calcite,julianhyde/calcite,jcamachor/calcite,julianhyde/calcite,julianhyde/calcite,looker-open-source/calcite,jcamachor/calcite,jcamachor/calcite,julianhyde/calcite,apache/calcite,looker-open-source/calcite,jcamachor/calcite,vlsi/calcite,vlsi/calcite,apache/calcite,jcamachor/calcite,apache/calcite,julianhyde/calcite,jcamachor/calcite