remove some cruft from the spec file

gimp.spec

@@ -108,9 +108,7 @@ License:        GPLv3+ and GPLv3
 %else
 License:        GPLv3+
 %endif
-Group:          Applications/Multimedia
 URL:            http://www.gimp.org/
-BuildRoot:      %{_tmppath}/%{name}-%{version}-root-%(%__id_u -n)
 %if %{with aalib}
 BuildRequires:  aalib-devel
 %endif
@@ -220,7 +218,6 @@ with multi-level undo.
 
 %package libs
 Summary:        GIMP libraries
-Group:          System Environment/Libraries
 License:        LGPLv3+
 
 %description libs
@@ -229,7 +226,6 @@ Manipulation Program (GIMP).
 
 %package devel
 Summary:        GIMP plugin and extension development kit
-Group:          Development/Libraries
 License:        LGPLv3+
 Requires:       gimp-libs%{?_isa} = %{?epoch:%{epoch}:}%{version}-%{release}
 Requires:       gimp-devel-tools = %{?epoch:%{epoch}:}%{version}-%{release}
@@ -245,7 +241,6 @@ extensions.
 
 %package devel-tools
 Summary:        GIMP plugin and extension development tools
-Group:          Development/Tools
 License:        LGPLv3+
 Requires:       gimp-devel = %{?epoch:%{epoch}:}%{version}-%{release}
 
@@ -256,7 +251,6 @@ Image Manipulation Program (GIMP) plug-ins and extensions.
 %if %{with helpbrowser}
 %package help-browser
 Summary:        GIMP help browser plug-in
-Group:          Applications/Multimedia
 License:        GPLv3+
 Requires:       gimp%{?_isa} = %{?epoch:%{epoch}:}%{version}-%{release}
 
@@ -416,7 +410,6 @@ cat << EOF > macros.gimp
 EOF
 
 %install
-rm -rf %{buildroot}
 make DESTDIR=%{buildroot} install
 install -D -m0644 macros.gimp %{buildroot}%{_rpmconfigdir}/macros.d/macros.gimp
 
@@ -439,8 +432,7 @@ find %buildroot -name \*.la -exec %__rm -f {} \;
 #
 # Plugins and modules change often (grab the executeable ones)
 #
-echo "%defattr (-, root, root)" > gimp-plugin-files
+find %{buildroot}%{_libdir}/gimp/%{lib_api_version} -type f | sed "s@^%{buildroot}@@g" | grep -v '\.a$' > gimp-plugin-files
-find %{buildroot}%{_libdir}/gimp/%{lib_api_version} -type f | sed "s@^%{buildroot}@@g" | grep -v '\.a$' >> gimp-plugin-files
 
 # .pyc and .pyo files don't exist yet
 grep "\.py$" gimp-plugin-files > gimp-plugin-files-py
@@ -451,8 +443,7 @@ for file in $(cat gimp-plugin-files-py); do
 done >> gimp-plugin-files
 
 %if %{with static}
-echo "%defattr (-, root, root)" > gimp-static-files
+find %{buildroot}%{_libdir}/gimp/%{lib_api_version} -type f | sed "s@^%{buildroot}@@g" | grep '\.a$' > gimp-static-files
-find %{buildroot}%{_libdir}/gimp/%{lib_api_version} -type f | sed "s@^%{buildroot}@@g" | grep '\.a$' >> gimp-static-files
 %endif
 
 #
@@ -509,9 +500,6 @@ popd
 %endif
 make check
 
-%clean
-rm -rf %{buildroot}
-
 %post
 update-desktop-database &> /dev/null || :
 touch --no-create %{_datadir}/icons/hicolor &>/dev/null || :
@@ -530,7 +518,6 @@ gtk-update-icon-cache %{_datadir}/icons/hicolor &>/dev/null || :
 %postun libs -p /sbin/ldconfig
 
 %files -f gimp.files
-%defattr(-, root, root, 0755)
 %license COPYING
 %doc AUTHORS ChangeLog NEWS README
 %doc docs/*.xcf*
@@ -597,7 +584,6 @@ gtk-update-icon-cache %{_datadir}/icons/hicolor &>/dev/null || :
 %{_datadir}/icons/hicolor/*/apps/gimp.png
 
 %files libs
-%defattr(-, root, root, 0755)
 %license COPYING
 %doc AUTHORS ChangeLog NEWS README
 %{_libdir}/libgimp-%{lib_api_version}.so.%{interface_age}.%{lib_minor}.%{lib_micro}
@@ -624,7 +610,6 @@ gtk-update-icon-cache %{_datadir}/icons/hicolor &>/dev/null || :
 %else
 %files devel
 %endif
-%defattr (-, root, root, 0755)
 %doc HACKING README.i18n
 %doc %{_datadir}/gtk-doc
 
@@ -642,7 +627,6 @@ gtk-update-icon-cache %{_datadir}/icons/hicolor &>/dev/null || :
 %{_rpmconfigdir}/macros.d/macros.gimp
 
 %files devel-tools
-%defattr (-, root, root, 0755)
 %{_bindir}/gimptool-%{lib_api_version}
 %{_mandir}/man1/gimptool-%{lib_api_version}.1*
 
@@ -653,7 +637,6 @@ gtk-update-icon-cache %{_datadir}/icons/hicolor &>/dev/null || :
 
 %if %{with helpbrowser}
 %files help-browser
-%defattr (-, root, root, 0755)
 %{_libdir}/gimp/%{lib_api_version}/plug-ins/help-browser
 %endif
 
@@ -661,6 +644,7 @@ gtk-update-icon-cache %{_datadir}/icons/hicolor &>/dev/null || :
 * Tue Oct 25 2016 Nils Philippsen <nils@redhat.com>
 - build without help-browser from Fedora 26 on (#1375809)
 - use %%license for license text
+- remove some cruft from the spec file
 
 * Sat Jul 16 2016 Nils Philippsen <nils@redhat.com> - 2:2.8.18-1
 - version 2.8.18