Fix accel 1.4 554 557 570 host abort in canUseHostGlobals

Change-Id: Icdb4e6926f85126572e6c4404c8ac39c2f3c2395

Author: ronlieb

openmp/libomptarget/plugins-nextgen/common/include/PluginInterface.h

@@ -1184,7 +1184,7 @@ struct GenericPluginTy {
 
   /// Return true if host globals can be enabled on a system that supprots
   /// unified shared memory.
-  virtual bool canUseHostGlobals() const {}
+  virtual bool canUseHostGlobals() const { return false; }
 
 protected:
   /// Indicate whether a device id is valid.