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>

libdc1394.spec

@@ -11,7 +11,6 @@ License: LGPLv2+
 Group: System Environment/Libraries
 URL: http://sourceforge.net/projects/libdc1394/
 Source: http://downloads.sourceforge.net/project/libdc1394/libdc1394-2/%{version}/libdc1394-%{version}.tar.gz
-BuildRoot: %{_tmppath}/%{name}-%{version}-%{release}-root
 ExcludeArch: s390 s390x
 
 BuildRequires: kernel-headers