[4.0] 30f32b6 Copy from source where the file exists.

[Lasse Karstensen]

commit 30f32b65ee3135b101c57621a2aa483f651fc73f
Author: Lasse Karstensen <lkarsten at varnish-software.com>
Date:   Mon May 19 11:27:46 2014 +0200

    Copy from source where the file exists.
    
    With parallell builds, building this file has usually not happened yet
    in the build directory.
    
    Suggested by: Martin

diff --git a/doc/sphinx/Makefile.am b/doc/sphinx/Makefile.am
index e714383..dbed031 100644
--- a/doc/sphinx/Makefile.am
+++ b/doc/sphinx/Makefile.am
@@ -212,11 +212,11 @@ include/varnishhist_synopsis.rst: $(top_builddir)/bin/varnishhist/varnishhist_op
 BUILT_SOURCES += include/varnishhist_options.rst \
 	 include/varnishhist_synopsis.rst
 
-reference/vmod_std.generated.rst: $(top_builddir)/lib/libvmod_std/vmod_std.rst
+reference/vmod_std.generated.rst: $(top_srcdir)/lib/libvmod_std/vmod_std.rst
 	cp $? $@
 BUILT_SOURCES += reference/vmod_std.generated.rst
 
-reference/vmod_directors.generated.rst: $(top_builddir)/lib/libvmod_directors/vmod_directors.rst
+reference/vmod_directors.generated.rst: $(top_srcdir)/lib/libvmod_directors/vmod_directors.rst
 	cp $? $@
 BUILT_SOURCES += reference/vmod_directors.generated.rst