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>

gnome-commander.spec

@@ -75,7 +75,6 @@ Source0:       ftp://ftp.gnome.org/pub/GNOME/sources/%{name}/1.8/%{name}-%{versi
 Source1:       gnome-commander.sh
 Source10:      mimeedit-svn%{mimeedit_rev}.sh
 Patch1:        gnome-commander-1.6.0-path-fedora-specific.patch
-BuildRoot:     %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
 
 BuildRequires: desktop-file-utils
 BuildRequires: gettext