Modernize spec file

indent.spec

@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
 Summary:    A GNU program for formatting C code
 Name:       indent
 Version:    2.2.12
@@ -74,10 +73,10 @@ autoreconf -i -f
 %build
 # Enable 64-bit stat(2)
 %configure CFLAGS='%optflags -D_FILE_OFFSET_BITS=64'
-make %{?_smp_mflags}
+%{make_build}
 
 %install
-make DESTDIR=$RPM_BUILD_ROOT install
+%{make_install}
 rm -f $RPM_BUILD_ROOT/%{_infodir}/dir $RPM_BUILD_ROOT/%{_bindir}/texinfo2man \
     $RPM_BUILD_ROOT/usr/doc/indent/indent.html