Always include the CentOS 5 patch in SRPM to fix mock builds

When using mock for builds on CentOS 6 to build packages for CentOS 5, the SRPM is built on CentOS 6. The patch file doesn't get included, which makes the CentOS 5 build fail. This change causes the patch file to be included always. This is harmless for CentOS 6 builds, because the patch won't be applied there.