Use make macros

https://fedoraproject.org/wiki/Changes/UseMakeBuildInstallMacro

nbdkit.spec

@@ -45,7 +45,7 @@ ExclusiveArch:  x86_64
 
 Name:           nbdkit
 Version:        1.21.19
-Release:        1%{?dist}
+Release:        2%{?dist}
 Summary:        NBD server
 
 License:        BSD
@@ -688,7 +688,7 @@ autoreconf -i
 # to avoid RHBZ#1404631 happening again silently.
 grep '^PYTHON_VERSION = 3' Makefile
 
-make %{?_smp_mflags}
+%make_build
 
 
 %install
@@ -725,7 +725,7 @@ truncate -s 0 tests/test-nbd-tls.sh tests/test-nbd-tls-psk.sh
 export LIBGUESTFS_DEBUG=1
 export LIBGUESTFS_TRACE=1
 
-make %{?_smp_mflags} check || {
+%make_build check || {
     cat tests/test-suite.log
     exit 1
   }
@@ -1064,6 +1064,10 @@ make %{?_smp_mflags} check || {
 
 
 %changelog
+* Tue Jul 21 2020 Tom Stellard <tstellar@redhat.com> - 1.21.19-2
+- Use make macros
+- https://fedoraproject.org/wiki/Changes/UseMakeBuildInstallMacro
+
 * Sat Jul 18 2020 Richard W.M. Jones <rjones@redhat.com> - 1.21.19-1
 - New upstream development version 1.21.19.
 - New nbdkit-cdi-plugin.