Slightly change and ammend the .ompi_unignore test in autogen.sh.

Components are now unignored if:

- .ompi_unignore exists, and
- .ompi_unignore contains at least one of the following:
  - regexp matching "$USER$"
  - regexp matching "$USER@$HOST"

This allows selective unignoring of components for only specific
development hosts rather that everywhere a given username is used.

This commit was SVN r5664.

autogen.sh

@@ -464,9 +464,9 @@ EOF
 ***   `pwd`
 
 EOF
-        elif test -f .ompi_ignore && \
-             test -s .ompi_unignore && \
-             test -z "`grep $USER .ompi_unignore`" ; then
+        elif test -f .ompi_ignore -a \
+             -s .ompi_unignore -a \
+             -z "`egrep $USER\$\|$USER@$HOST .ompi_unignore`" ; then
 
             # If we have a non-empty .ompi_unignore and our username
             # is in there somewhere, we ignore the .ompi_ignore (and