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>

libmodplug.spec

@@ -10,7 +10,6 @@ URL:            http://modplug-xmms.sourceforge.net/
 Source0:        http://downloads.sourceforge.net/modplug-xmms/%{name}-%{version}.tar.gz
 # Fedora specific, no need to send upstream
 Patch0:         %{name}-0.8.9.0-timiditypaths.patch
-BuildRoot:      %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
 
 %if 0%{?fedora} || 0%{?rhel} > 7
 Suggests:       %{_sysconfdir}/timidity.cfg