Amending 6dc740f0 with additional Provides.

As Ingar mentions in #1445, this is a workaround for the
dependency issue.

Originally attempt at a shorter fix in 6dc740f0 didn't work out.

redhat/varnish.spec

@@ -50,6 +50,10 @@ Summary: Libraries for %{name}
 Group: System Environment/Libraries
 BuildRequires: ncurses-devel
 Provides: libvarnishapi.so.1
+Provides: libvarnishapi.so.1(LIBVARNISHAPI_1.0)(64bit)
+Provides: libvarnishapi.so.1(LIBVARNISHAPI_1.1)(64bit)
+Provides: libvarnishapi.so.1(LIBVARNISHAPI_1.2)(64bit)
+Provides: libvarnishapi.so.1(LIBVARNISHAPI_1.3)(64bit)
 #Obsoletes: libvarnish1
 
 %description libs