Use __isa_bits macro instead of list of 64-bit architectures

credits:  Marcin Juszkiewicz

libsndfile.spec

@@ -1,7 +1,7 @@
 Summary:	Library for reading and writing sound files
 Name:		libsndfile
 Version:	1.0.25
-Release:	16%{?dist}
+Release:	17%{?dist}
 License:	LGPLv2+ and GPLv2+ and BSD
 Group:		System Environment/Libraries
 URL:		http://www.mega-nerd.com/libsndfile/
@@ -83,14 +83,8 @@ rm -rf $RPM_BUILD_ROOT%{_docdir}/libsndfile1-dev
 find %{buildroot} -type f -name "*.la" -delete
 
 # fix multilib issues
-%ifarch aarch64 %{power64} s390x x86_64
-%define wordsize 64
-%else
-%define wordsize 32
-%endif
-
 mv %{buildroot}%{_includedir}/sndfile.h \
-   %{buildroot}%{_includedir}/sndfile-%{wordsize}.h
+   %{buildroot}%{_includedir}/sndfile-%{__isa_bits}.h
 
 cat > %{buildroot}%{_includedir}/sndfile.h <<EOF
 #include <bits/wordsize.h>
@@ -150,12 +144,15 @@ LD_LIBRARY_PATH=$PWD/src/.libs make check
 %doc __docs/* ChangeLog
 %{_includedir}/sndfile.h
 %{_includedir}/sndfile.hh
-%{_includedir}/sndfile-%{wordsize}.h
+%{_includedir}/sndfile-%{__isa_bits}.h
 %{_libdir}/%{name}.so
 %{_libdir}/pkgconfig/sndfile.pc
 
 
 %changelog
+* Thu Aug 27 2015 Marcin Juszkiewicz <mjuszkiewicz@redhat.com> - 1.0.25-17
+- Use __isa_bits macro instead of list of 64-bit architectures
+
 * Sun Jul 19 2015 Peter Robinson <pbrobinson@fedoraproject.org> 1.0.25-16
 - Fix FTBFS
 - Use %%license