Fix error in clang10 for Meerkat

PhysTools/Meerkat/src/AbsPhaseSpace.cpp

@@ -2,6 +2,7 @@
 #include <vector>
 
 #include "Meerkat/AbsPhaseSpace.hh"
+#include <cstring>
 
 AbsPhaseSpace::AbsPhaseSpace(const char* phaseSpaceName) {
   strncpy(m_name, phaseSpaceName, 255);