Remove BuildRoot definition

None of currently supported distributions need that.
It was needed last for EL5 which is EOL now

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

perl-Crypt-DES.spec

@@ -6,7 +6,6 @@ License:        BSD
 Group:          Development/Libraries
 URL:            http://search.cpan.org/dist/Crypt-DES/
 Source0:        http://www.cpan.org/authors/id/D/DP/DPARIS/Crypt-DES-%{version}.tar.gz
-BuildRoot:      %{_tmppath}/%{name}-%{version}-%{release}-root-%(id -nu)
 BuildRequires:  perl-interpreter
 BuildRequires:  perl-devel
 BuildRequires:  perl-generators