add missing header

mpi/Makefile.am

@@ -49,7 +49,8 @@ lib_LTLIBRARIES = libstarpumpi.la
 libstarpumpi_la_LIBADD = $(top_builddir)/src/libstarpu.la
 
 noinst_HEADERS =					\
-	starpu_mpi_private.h
+	starpu_mpi_private.h				\
+	starpu_mpi_fxt.h
 
 include_HEADERS =					\
 	starpu_mpi.h					\