units.spec: use %make_build and %make_install RPM macros

No change in behavior expected with this commit.

units.spec

@@ -1,7 +1,7 @@
 Summary: A utility for converting amounts from one unit to another
 Name: units
 Version: 2.22
-Release: 1%{?dist}
+Release: 2%{?dist}
 Source: https://ftp.gnu.org/gnu/units/%{name}-%{version}.tar.gz
 URL: https://www.gnu.org/software/units/units.html
 License: GPLv3+
@@ -32,10 +32,10 @@ autoreconf -fiv
 
 %build
 %configure
-make %{?_smp_mflags}
+%make_build
 
 %install
-make install DESTDIR=%{buildroot} 
+%make_install
 
 # remove %%{buildroot} from the target of an absolute symlink
 ln -fsv %{_sharedstatedir}/units/currency.units %{buildroot}%{_datadir}/units
@@ -58,6 +58,9 @@ make check
 %{_mandir}/man1/*
 
 %changelog
+* Tue Sep 06 2022 Kamil Dudka <kdudka@redhat.com> - 2.22-2
+- use %%make_build and %%make_install RPM macros
+
 * Tue Sep 06 2022 Kamil Dudka <kdudka@redhat.com> - 2.22-1
 - new upstream release