libungif: update config.* scripts; refactor style

Signed-off-by: David Abdurachmanov <David.Abdurachmanov@cern.ch>

libungif.spec

@@ -3,16 +3,22 @@
 Source: http://switch.dl.sourceforge.net/sourceforge/giflib/%{n}-%{realversion}.tar.gz
 
 %prep
-%setup -n %n-%{realversion}
+%setup -n %{n}-%{realversion}
 
 %build
+# Update to detect aarch64 and ppc64le
+rm -f ./config.{sub,guess}
+curl -L -k -s -o ./config.sub 'http://git.savannah.gnu.org/gitweb/?p=config.git;a=blob_plain;f=config.sub;hb=HEAD'
+curl -L -k -s -o ./config.guess 'http://git.savannah.gnu.org/gitweb/?p=config.git;a=blob_plain;f=config.guess;hb=HEAD'
+chmod +x ./config.{sub,guess}
+
 ./configure --prefix=%{i} --disable-static
-make %makeprocesses
+make %{makeprocesses}
 
 %install
 make install
 # Strip libraries, we are not going to debug them.
-%define strip_files %i/lib
+%define strip_files %{i}/lib
 # Drop all the perl scripts. They are not needed and force the installation of
 # more packages on Ubuntu.
-%define drop_files %i/bin
+%define drop_files %{i}/bin