build: cleanup filelists

compile tested and checked that pkgs still contain the kernel config on
interesting distributions:

./lbbuild drbd -v 9.0.14-1 -k all -d rhel7.5 rhel6.0 \
    sles11-sp4 sles12-sp3 xenserver6.5 xenserver7.2

filelist-redhat

@@ -1,11 +1,6 @@
 %defattr(644,root,root,755)
 %doc COPYING
 %doc ChangeLog
-%if 0%(grep -q "release 5" /etc/redhat-release && echo 1)
-/lib/modules/%verrel%variant
-%doc obj/k-config-%verrel%variant.gz
-%else
 /lib/modules/%verrel%dotvariant
 %doc obj/k-config-%verrel%dotvariant.gz
-%endif
 %config /etc/depmod.d/drbd.conf

filelist-suse

@@ -1,11 +1,5 @@
 %defattr(-,root,root)
 %doc COPYING
 %doc ChangeLog
-%if %{defined 3}
-# on sles10, _suse_kernel_module_subpackage takes 3 arguments still
-/lib/modules/%3-%1
-%doc obj/k-config-%3-%1.gz
-%else
 /lib/modules/%2-%1
 %doc obj/k-config-%2-%1.gz
-%endif