[nodejs-muffin] Add logic for ExclusiveArch macro

[Jamie Nguyen]

commit 43efe7bbb750252a24dd6cd5ffdc6cac3043b169
Author: Jamie Nguyen <j at jamielinux.com>
Date:   Mon Jul 22 11:18:57 2013 +0100

    Add logic for ExclusiveArch macro

 nodejs-muffin.spec |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/nodejs-muffin.spec b/nodejs-muffin.spec
index 8bac7d6..3554143 100644
--- a/nodejs-muffin.spec
+++ b/nodejs-muffin.spec
@@ -11,7 +11,11 @@ URL:        http://hornairs.github.com/muffin/
 Source0:    http://registry.npmjs.org/muffin/-/muffin-%{version}.tgz
 
 BuildArch:  noarch
+%if 0%{?fedora} >= 19
 ExclusiveArch: %{nodejs_arches} noarch
+%else
+ExclusiveArch: %{ix86} x86_64 %{arm} noarch
+%endif
 
 BuildRequires:  nodejs-packaging
 Requires:       cloc