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>

liboggz.spec

@@ -9,7 +9,6 @@ URL:            http://www.xiph.org/oggz/
 Source0:        http://downloads.xiph.org/releases/liboggz/%{name}-%{version}.tar.gz
 # Always have oggz_off_t == loff_t even on 64-bit platforms
 Patch0:		liboggz-1.1.1-multilib.patch
-BuildRoot:      %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
 
 BuildRequires:  libogg-devel >= 1.0
 BuildRequires:  doxygen