Better fix than r14831 -- ddt_pack was removed from TESTS because it

calls MPI_INIT and that causes problems during make distcheck.  Instead
put it in check_PROGRAMS which lets it get built, but doesn't run it.

This commit was SVN r14832.

The following SVN revision numbers were found above:
  r14831 --> open-mpi/ompi@9258c5200a

test/datatype/Makefile.am

@@ -10,9 +10,9 @@
 # $HEADER$
 #
 
-TESTS = ddt_test ddt_pack checksum position
+TESTS = ddt_test checksum position
 
-check_PROGRAMS = $(TESTS) to_self
+check_PROGRAMS = $(TESTS) to_self ddt_pack
 
 ddt_test_SOURCES = ddt_test.c
 ddt_test_LDFLAGS = $(WRAPPER_EXTRA_LDFLAGS)