Remove %clean section

None of currently supported distributions need that.
Last one was EL5 which is EOL for a while.

Signed-off-by: Igor Gnatenko <ignatenkobrain@fedoraproject.org>

perl-Hash-Merge.spec

@@ -39,9 +39,6 @@ chmod -x %{buildroot}%{perl_vendorlib}/Hash/Merge.pm
 %check
 make test
 
-%clean
-rm -rf %{buildroot}
-
 %files
 %defattr(-,root,root,-)
 %doc Changes README.md