[libxc] Restore rhel conditional.

[Susi Lehtola]

commit a3a8c929378d2c2d7b114f008c080c00dce6ebe2
Author: Susi Lehtola <jussilehtola at fedoraproject.org>
Date:   Mon Mar 24 19:02:39 2014 +0200

    Restore rhel conditional.

 libxc.spec |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/libxc.spec b/libxc.spec
index 5192181..06b22a0 100644
--- a/libxc.spec
+++ b/libxc.spec
@@ -51,10 +51,11 @@ in order to compile programs against libxc.
 %prep
 %setup -q
 
+%if 0%{?rhel} == 5 || 0%{?rhel} == 6
 %ifarch ppc ppc64
 %patch0 -p1 -b .ppc
 %endif
-
+%endif
 
 %build
 # Don't insert C code during preprocessing