Merge pull request open-mpi#873 from ggouaillardet/topic/v1.10/pml_cm_missing_include_file

pml/cm: add missing #include <alloca.h>

Author: rhc54

ompi/mca/pml/cm/pml_cm.h

@@ -15,6 +15,10 @@
 #ifndef PML_CM_H
 #define PML_CM_H
 
+#ifdef HAVE_ALLOCA_H
+#include <alloca.h>
+#endif
+
 #include "ompi_config.h"
 #include "ompi/request/request.h"
 #include "ompi/mca/pml/pml.h"