Description of problem:
The epiphany spec file defines a %{major_version} macro to create and own the
extensions folders in /usr/lib*/epiphany/:
 mkdir -p
$RPM_BUILD_ROOT%{_libdir}/epiphany/%{major_version}/{plugins,extensions}
 ln -sf %{major_version}/plugins $RPM_BUILD_ROOT%{_libdir}/epiphany/plugins
 ln -sf %{major_version}/extensions
$RPM_BUILD_ROOT%{_libdir}/epiphany/extensions

In F17 spec, %{major_version} is set to 3.3 whereas it should be 3.4 (as for
the current Epiphany major version in the repos).

Not a critical issue, but it would help me to fix the epiphany-extensions to
work with epiphany 3.4 (extensions would be installed in
%{_libdir}/epiphany/3.4/extensions/, with %{_libdir}/epiphany/3.4/ supposed to
be owned by epiphany). Moreover, the epiphany-extensions may depend on the virtual Provides "epiphany(abi)", whose version is set too to %{major_version}