drop specifying and cleaning of buildroot

suitesparse.spec

@@ -381,7 +381,6 @@ pushd RBio
 popd
 
 %install
-rm -rf ${RPM_BUILD_ROOT}
 mkdir -p ${RPM_BUILD_ROOT}%{_libdir}
 mkdir -p ${RPM_BUILD_ROOT}%{_includedir}/%{name}
 pushd Lib
@@ -410,9 +409,6 @@ find */ -iname lesser.txt -o -iname license.txt -o -iname gpl.txt -o \
 # hardlink duplicate documentation files
 hardlink -cv Docs/ Licenses/
 
-%clean
-rm -rf ${RPM_BUILD_ROOT}
-
 %post -p /sbin/ldconfig
 
 %postun -p /sbin/ldconfig
@@ -441,6 +437,7 @@ rm -rf ${RPM_BUILD_ROOT}
 - version 4.4.4
 - fix URLs
 - remove obsolete patches
+- drop specifying and cleaning of buildroot
 
 * Sat May 02 2015 Kalev Lember <kalevlember@gmail.com> - 4.3.1-5
 - Rebuilt for GCC 5 C++11 ABI change