Use %set_build_flags instead of passing build flags individually

dwz.spec

@@ -1,7 +1,7 @@
 Summary: DWARF optimization and duplicate removal tool
 Name: dwz
 Version: 0.14
-Release: 1%{?dist}
+Release: 2%{?dist}
 License: GPLv2+ and GPLv3+
 Source: %{name}-0.14.tar.xz
 BuildRequires: gcc, gcc-c++, gdb, elfutils-libelf-devel, dejagnu
@@ -20,12 +20,12 @@ and using DW_TAG_imported_unit to import it into each CU that needs it.
 %setup -q -n dwz
 
 %build
-%make_build CFLAGS='%{optflags}' LDFLAGS='%{build_ldflags}' \
-  prefix=%{_prefix} mandir=%{_mandir} bindir=%{_bindir}
+%set_build_flags
+%make_build
 
 %install
 rm -rf %{buildroot}
-%make_install prefix=%{_prefix} mandir=%{_mandir} bindir=%{_bindir}
+%make_install
 
 %check
 make check
@@ -36,6 +36,9 @@ make check
 %{_mandir}/man1/dwz.1*
 
 %changelog
+* Wed Apr 14 2021 Timm Bäder <tbaeder@redhat.com> 0.14-2
+- Use set_build_flags macro
+
 * Tue Mar 09 2021 Jakub Jelinek <jakub@redhat.com> 0.14-1
 - update to a new upstream release