[Varnish] #1479: Building man pages fails when building outside of the source tree.

[Varnish]

#1479: Building man pages fails when building outside of the source tree.
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 Reporter:  basile@…  |       Type:  defect
   Status:  new       |   Priority:  normal
Milestone:            |  Component:  build
  Version:  4.0.0     |   Severity:  normal
 Keywords:            |
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 When building varnish 4.0.0 outside of the source tree, making vmod_std.3
 and vmod_directors.3 fail because they depend on
 lib/libvmod_std/vmod_std.man.rst and
 lib/libvmod_directors/vmod_directors.man.rst which are generated under the
 top_builddir and not under the top_srcdir.

 The attached patch fixes the build

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Ticket URL: <https://www.varnish-cache.org/trac/ticket/1479>
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