Use make_build macro instead of just make

https://docs.fedoraproject.org/en-US/packaging-guidelines/#_parallel_make

mod_auth_mellon.spec

@@ -1,7 +1,7 @@
 Summary: A SAML 2.0 authentication module for the Apache Httpd Server
 Name: mod_auth_mellon
 Version: 0.16.0
-Release: 1%{?dist}
+Release: 2%{?dist}
 Source0: https://github.com/latchset/mod_auth_mellon/releases/download/v0_16_0/mod_auth_mellon-0.16.0.tar.gz
 Source1: auth_mellon.conf
 Source2: 10-auth_mellon.conf
@@ -34,12 +34,12 @@ received in assertions generated by a IdP server.
 export APXS=%{_httpd_apxs}
 %configure --enable-diagnostics
 make clean
-make %{?_smp_mflags}
+%{make_build}
 cp .libs/%{name}.so %{name}-diagnostics.so
 
 %configure
 make clean
-make %{?_smp_mflags}
+%{make_build}
 pushd doc/user_guide
 asciidoctor -a data-uri mellon_user_guide.adoc
 popd
@@ -101,6 +101,10 @@ in the doc directory for instructions on using the diagnostics build.
 %dir /run/%{name}/
 
 %changelog
+* Thu Feb 13 2020 Tom Stellard <tstellar@redhat.com> - 0.16.0-2
+- Use make_build macro instead of just make
+- https://docs.fedoraproject.org/en-US/packaging-guidelines/#_parallel_make
+
 * Mon Feb  3 2020 Jakub Hrozek <jhrozek@redhat.com> - 0.16.0-1
 - New upstream version 0.16.0