Fixes to support builds on ARM processors

Minor changes to fix compilation on ARM

• disable Google heapchecker test
• do not use VectorClass instrset_detect.cpp (it only supports x86-64)

The change for VectorClass makes System::instructionsetLevel() return -1 on ARM.

To do

• fix test reference files

GaudiExamples/tests/qmtest/gaudiexamples.qms/google_auditors.qms/heapchecker.qmt

@@ -45,6 +45,8 @@ ApplicationMgr(EvtMax=10,
   <text>lsan</text>
   <text>ubsan</text>
   <text>tsan</text>
+  <text>^arm</text>
+  <text>^aarch</text>
 </set></argument>
 <argument name="validator"><text>
 # hide a difference between JobOptionsSvc and Configurables