Small patch to prevent fighting with svn replacing a manually-removed

.ompi_ignore file.

If you have an empty .ompi_unignore file (presumably alongside an
.ompi_ignore file), we'll build the component.

If you have a non-empty .ompi_unignore file (presumable alongside an
.ompi_ignore file), and your username can be found in that file, we'll
build the component.  If your username is *not* the the .ompi_unignore
file, we *won't* build the component.

This commit was SVN r3747.

autogen.sh

@@ -448,12 +448,33 @@ process_dir() {
 ***   `pwd`
 
 EOF
-	elif test -f .ompi_ignore; then
+	elif test -f .ompi_ignore -a ! -f .ompi_unignore; then
+
+            # Note that if we have an empty (but existant)
+            # .ompi_unignore, then we ignore the .ompi_ignore file
+            # (and therefore build the component)
+
 	    cat <<EOF
 
 *** Found .ompi_ignore file -- skipping entire tree:
 ***   `pwd`
 
+EOF
+        elif test -f .ompi_ignore -a \
+             test -s .ompi_unignore -a \
+             test -z "`grep $USER .ompi_unignore`" ; then
+
+            # If we have a non-empty .ompi_unignore and our username
+            # is in there somewhere, we ignore the .ompi_ignore (and
+            # therefore build the component).  Otherwise, this
+            # condition is true and we don't configure.
+
+	    cat <<EOF
+
+*** Found .ompi_ignore file and .ompi_unignore didn't invalidate -- 
+*** skipping entire tree:
+***   `pwd`
+
 EOF
 	elif test "$pd_abs_dir" != "$pd_ompi_topdir" -a -x autogen.sh; then
 	    cat <<EOF