Build options: Use FFTW instead of the bundled KissFFT

The libfftw3 dependency is no longer sufficient to implicitly enable it!
This behavior has changed from version 1.9.0 to 1.9.1.

libsamplerate was already used implicitly but enabling it explicitly
will avoid that it is silently ignored after a future update.

rubberband.spec

@@ -1,6 +1,6 @@
 Name:           rubberband
 Version:        1.9.1
-Release:        1%{?dist}
+Release:        2%{?dist}
 Summary:        Audio time-stretching and pitch-shifting library
 
 License:        GPLv2+
@@ -37,7 +37,7 @@ developing applications that use %{name}.
 
 
 %build
-%meson
+%meson -Dfft=fftw -Dresampler=libsamplerate
 %meson_build
 
 
@@ -69,6 +69,10 @@ rm -rf $RPM_BUILD_ROOT%{_libdir}/*.a
 
 
 %changelog
+* Thu May 08 2021 Uwe Klotz <uwe.klotz@gmail.com> - 1.9.1-2
+- Use FFTW instead of KissFFT: https://github.com/breakfastquay/rubberband/issues/37
+- Explicitly enable libsamplerate
+
 * Wed Mar 17 2021 Michel Alexandre Salim <salimma@fedoraproject.org> - 1.9.1-1
 - Update to 1.9.1