rocshmem_config.h has a different include path when installed and built-dir (#186)

* rocshmem_config.h needs to be in a similar directory structure for
includes to work when building testers in build, and from an installed
library

* Do not change installed rocshmem.hpp

src/ipc/context_ipc_host.cpp

@@ -26,7 +26,7 @@
 
 #include <mpi.h>
 
-#include "rocshmem_config.h"  // NOLINT(build/include_subdir)
+#include "rocshmem/rocshmem_config.h"  // NOLINT(build/include_subdir)
 #include "../backend_type.hpp"
 #include "../context_incl.hpp"
 #include "backend_ipc.hpp"