Explicitly build with O2 to avoid build errors

Author: smuzaffar

Geometry/HGCalCommonData/plugins/BuildFile.xml

@@ -1,4 +1,5 @@
 <library name="GeometryHGCalCommonDataPlugin" file="DD*.cc">
+  <flags CXXFLAGS="-O2" file="DDHGCalPassive.cc"/>
   <use name="DetectorDescription/Core"/>
   <use name="FWCore/Framework"/>
   <use name="FWCore/MessageLogger"/>
@@ -23,6 +24,7 @@
 </library>
 
 <library name="DD4hep_GeometryHGCalCommonDataPlugins" file="dd4hep/*.cc">
+  <flags CXXFLAGS="-O2" file="DDHGCalPassive.cc"/>
   <use name="DetectorDescription/DDCMS"/>
   <use name="Geometry/HGCalCommonData"/>
   <use name="dd4hep"/>