hipcc on Crusher: function bcopy undefined (compiler does not have openmp enabled?)

[james-simone]

Builtin function bcopy is undefined when the compiler does not have openmp. The workaround is to include the header strings.h.

`
diff --git a/Grid/threads/Threads.h b/Grid/threads/Threads.h
index 6887134d..52a3dfde 100644
--- a/Grid/threads/Threads.h
+++ b/Grid/threads/Threads.h
@@ -40,6 +40,7 @@ Author: paboyle paboyle@ph.ed.ac.uk
// New primitives; explicit host thread calls, and accelerator data parallel calls
//////////////////////////////////////////////////////////////////////////////////

+#include <strings.h>
#ifdef _OPENMP
#define GRID_OMP
#include <omp.h>
`

[paboyle]

Fixed on develop (was already fixed on a branch - it affects SYCL too)