[master] e221c0c link to builddir for make target "all" so make in man/ finds all files in place

[Nils Goroll]

commit e221c0c54928f5ec116b3df2ce89b24cf00787c9
Author: Nils Goroll <nils.goroll at uplex.de>
Date:   Wed Dec 7 15:13:06 2016 +0100

    link to builddir for make target "all" so make in man/ finds all files in place

diff --git a/doc/sphinx/Makefile.am b/doc/sphinx/Makefile.am
index 9001cb8..6c28f54 100644
--- a/doc/sphinx/Makefile.am
+++ b/doc/sphinx/Makefile.am
@@ -42,6 +42,8 @@ graphviz:
 
 sphinx_prereq: link_srcdir graphviz conf.py
 
+all: link_srcdir
+
 html: sphinx_prereq
 	$(SPHINXBUILD) -b html $(ALLSPHINXOPTS) $(BUILDDIR)/html
 	@echo