make target 'pbctestfiles': Why not in 'all'?

[James E Keenan]

Will Coleda wrote:
> IIRC, these files are /only/ used for testing, not for install, so
> this is a reasonable location to put the requirement.
>

Thanks.  In r49340, I added to the comment explaining the purpose of 
these files.

$ svn diff config/
Index: config/gen/makefiles/root.in
===================================================================
--- config/gen/makefiles/root.in        (revision 49339)
+++ config/gen/makefiles/root.in        (working copy)
@@ -1764,7 +1764,8 @@
      t/pmc/testlib/annotations.pbc \
      t/pmc/testlib/number.pbc

-# pbc files used for several tests
+# pbc files used for several tests;
+# not needed for build, hence this target is not included in 'all'
  pbctestfiles: $(PARROT) $(PBC_TEST_FILES)

  t/pmc/testlib/number.pbc: t/pmc/testlib/number.pasm