[tracker] docs: delete xml folder before regenerating ontology docs

[Carlos Garnacho <carlosg src gnome org>]

commit 68e4194cb4868ca77ec7ec1a69b204e7607663c1
Author: Carlos Garnacho <carlosg gnome org>
Date:   Wed Jul 1 10:30:44 2015 +0200

    docs: delete xml folder before regenerating ontology docs
    
    Otherwise it simply fails if there happens to be stale data

 docs/reference/ontology/Makefile.am |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/docs/reference/ontology/Makefile.am b/docs/reference/ontology/Makefile.am
index f4dc460..a7eeafa 100644
--- a/docs/reference/ontology/Makefile.am
+++ b/docs/reference/ontology/Makefile.am
@@ -12,7 +12,7 @@ ONTOLOGY_EXPLANATIONS =                                \
 
 # Generation of the ontology XML files.
 gen-doc.stamp: $(ONTOLOGY_EXPLANATIONS)
-       mkdir xml
+       rm -rf xml && mkdir xml
        $(top_srcdir)/docs/tools/gen-doc.sh $(top_builddir)/docs/tools/ttl2sgml 
$(top_builddir)/docs/tools/ttlresource2sgml $(top_srcdir)/src/ontologies $(top_srcdir)/docs/ontologies xml/
        $(AM_V_GEN) touch $@