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-DateTime-Calendar-Mayan.spec

@@ -6,7 +6,6 @@ Group:		Development/Libraries
 Summary:	Mayan Long Count Calendar 
 Url:		http://search.cpan.org/dist/DateTime-Calendar-Mayan
 Source:		http://search.cpan.org/CPAN/authors/id/J/JH/JHOBLITT/DateTime-Calendar-Mayan-%{version}.tar.gz 
-BuildRoot:	%{_tmppath}/%{name}-%{version}-%{release}-root-%(id -nu) 
 BuildArch:	noarch
 BuildRequires:	perl-generators
 BuildRequires:	perl(DateTime) >= 0.15