[tracker] docs: Do not delete xml directory when redoing docs

[Carlos Garnacho <carlosg src gnome org>]

commit 8a5ba082959b8439993f4d731445db12a4c5e301
Author: Carlos Garnacho <carlosg gnome org>
Date:   Sat May 28 20:44:19 2016 +0200

    docs: Do not delete xml directory when redoing docs
    
    We're competing with gtk-doc.make here, which may turn out in
    failures when doing mkdir on an already created directory, or
    failures in writing xml/gtkdocentities.ent because we deleted
    the directory under its feet.
    
    So just do the same, use MKDIR_P to ensure it won't fail if
    the directory is already there, and don't bother deleting it
    as it's handled in gtk-doc.make. The ontology docs helper app
    will rewrite the xml files anyway.

 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 a7eeafa..1c6a2c2 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)
-       rm -rf xml && mkdir xml
+       $(MKDIR_P) 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 $@