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-Test-Synopsis.spec

@@ -83,9 +83,6 @@ make test
 make test TEST_FILES="$(echo $(find xt/ -name '*.t'))"
 %endif
 
-%clean
-rm -rf %{buildroot}
-
 %files
 %if 0%{?_licensedir:1}
 %license LICENSE