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-Digest-MD4.spec

@@ -6,7 +6,6 @@ Group:		Development/Libraries
 License:	GPL+ or Artistic
 URL:		http://search.cpan.org/dist/Digest-MD4/
 Source0:	http://search.cpan.org/CPAN/authors/id/M/MI/MIKEM/DigestMD4/Digest-MD4-%{version}.tar.gz
-BuildRoot:	%{_tmppath}/%{name}-%{version}-%{release}-root-%(id -nu)
 # Module Build
 %if 0%{?fedora} > 13 || 0%{?rhel} > 6
 BuildRequires:	libdb-devel