[ast/epel7] Add %{_pkgdocdir} macro

[Orion Poplawski]

commit a6f097a23555a8c4461896114a066bc9813d64d2
Author: Orion Poplawski <orion at nwra.com>
Date:   Thu Jan 23 13:24:59 2014 -0700

    Add %{_pkgdocdir} macro

 ast.spec |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/ast.spec b/ast.spec
index bd15fe5..cb2fcbc 100644
--- a/ast.spec
+++ b/ast.spec
@@ -1,3 +1,5 @@
+%{!?_pkgdocdir: %global _pkgdocdir %{_docdir}/%{name}-%{version}}
+
 Name:           ast
 Version:        7.3.3
 Release:        1%{?dist}