Merged update from upstream sources

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Source: https://src.fedoraproject.org/rpms/fftw.git#994963bb8abc7423c3f3b6bab759050eab85aef9

fftw.spec

@@ -14,7 +14,7 @@
 
 Name:           fftw
 Version:        3.3.8
-Release:        9%{?dist}
+Release:        10%{?dist}
 Summary:        A Fast Fourier Transform library
 License:        GPLv2+
 URL:            http://www.fftw.org
@@ -45,6 +45,7 @@ BuildRequires:  openmpi-devel
 %if %{with mpich} || %{with openmpi}
 BuildRequires:  environment-modules
 %endif
+BuildRequires: make
 
 
 %description
@@ -542,6 +543,9 @@ done
 %endif
 
 %changelog
+* Tue Jan 26 2021 Fedora Release Engineering <releng@fedoraproject.org> - 3.3.8-10
+- Rebuilt for https://fedoraproject.org/wiki/Fedora_34_Mass_Rebuild
+
 * Sat Aug 01 2020 Fedora Release Engineering <releng@fedoraproject.org> - 3.3.8-9
 - Second attempt - Rebuilt for
   https://fedoraproject.org/wiki/Fedora_33_Mass_Rebuild