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>

rubberband.spec

@@ -8,7 +8,6 @@ License:        GPLv2+
 URL:            http://www.breakfastquay.com/rubberband/
 Source0:        http://code.breakfastquay.com/attachments/download/34/rubberband-1.8.1.tar.bz2
 Patch0:         %{name}-1.5.0-mk.patch
-BuildRoot:      %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
 
 BuildRequires:  fftw-devel libsamplerate-devel libsndfile-devel
 BuildRequires:  ladspa-devel vamp-plugin-sdk-devel