fftw: changed to use case statement to check if the i386 hacks can be enabled

multimedia/fftw/fftw.conf

@@ -15,9 +15,11 @@
 # --- SDE-COPYRIGHT-NOTE-END ---
 
 # Optimization
-if [ $arch_machine = i686 -o $arch_machine = i586 -o $arch_machine = i486 -o $arch_machine = Intel -o $arch_machine = k6 -o $arch_machine = k7 ] ; then
+case "$arch_machine" in
+	i486|i586|i686|Intel|k6|k7)
 	        var_append extraconfopt ' ' '--enable-i386-hacks'
 		echo_status "Enable i386 hacks"
-fi
+		;;
+esac
 
 var_append extraconfopt ' ' '--enable-threads'