Merge pull request #9723 from cms-sw/smuzaffar-patch-4

eigen: Fix enum arithmetic: changes from upstream

Author: smuzaffar

eigen.spec

@@ -2,7 +2,7 @@
 ## INITENV +PATH PKG_CONFIG_PATH %{i}/share/pkgconfig
 ## NOCOMPILER
 ## INCLUDE cpp-standard
-%define tag 4dce4ce667e0a8ed2a44f4ee4eafcc3972626f08
+%define tag 6c8cca61b173180e2013bd76d33099c665ccb858
 %define branch cms/master/%{realversion}
 %define github_user cms-externals
 Source: git+https://github.com/%{github_user}/eigen-git-mirror.git?obj=%{branch}/%{tag}&export=%{n}-%{realversion}&output=/%{n}-%{realversion}-%{tag}.tgz