Modernize spec file

indent.spec

@@ -1,8 +1,7 @@
-# -*- coding: utf-8 -*-
-Summary: A GNU program for formatting C code
-Name: indent
-Version: 2.2.12
-Release: 3%{?dist}
+Summary:    A GNU program for formatting C code
+Name:       indent
+Version:    2.2.12
+Release:    3%{?dist}
 # COPYING:                      GPLv3 text
 # doc/indent.info:              Verbatim (generated from doc/indent.texi)
 #   <http://lists.gnu.org/archive/html/bug-indent/2018-09/msg00008.html>
@@ -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