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-Crypt-DES.spec

@@ -45,9 +45,6 @@ find $RPM_BUILD_ROOT -type f -name '*.bs' -size 0 -exec rm -f {} \;
 %check
 make test
 
-%clean
-rm -rf $RPM_BUILD_ROOT
-
 %files
 %doc COPYRIGHT README
 %{perl_vendorarch}/auto/Crypt/