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>

libgeotiff.spec

@@ -6,7 +6,6 @@ Group:     System Environment/Libraries
 License:   MIT
 URL:       http://trac.osgeo.org/geotiff/
 Source:    http://download.osgeo.org/geotiff/%{name}/%{name}-%{version}.tar.gz
-BuildRoot: %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
 BuildRequires: libtiff-devel libjpeg-devel proj-devel zlib-devel
 
 %description