fftwLongDouble: 3.3.7 -> 3.3.8 (#41299)

Semi-automatic update generated by https://github.com/ryantm/nixpkgs-update tools.

This update was made based on information from https://repology.org/metapackage/fftw-long-double/versions.

These checks were done:

- built on NixOS

- 0 of 0 passed binary check by having a zero exit code.
- 0 of 0 passed binary check by having the new version present in output.
- found 3.3.8 with grep in /nix/store/7csndk7q4h2wvv46ndgh6lm4j0ybx9zf-fftw-long-double-3.3.8
- directory tree listing: https://gist.github.com/05084878f5535b72e17b90667821c468
- du listing: https://gist.github.com/174653df406b155bf1a9c07da9257f54

pkgs/development/libraries/fftw/default.nix

@@ -5,7 +5,7 @@ with lib;
 assert elem precision [ "single" "double" "long-double" "quad-precision" ];
 
 let
-  version = "3.3.7";
+  version = "3.3.8";
   withDoc = stdenv.cc.isGNU;
 in
 
@@ -14,7 +14,7 @@ stdenv.mkDerivation rec {
 
   src = fetchurl {
     url = "ftp://ftp.fftw.org/pub/fftw/fftw-${version}.tar.gz";
-    sha256 = "0wsms8narnbhfsa8chdflv2j9hzspvflblnqdn7hw8x5xdzrnq1v";
+    sha256 = "00z3k8fq561wq2khssqg0kallk0504dzlx989x3vvicjdqpjc4v1";
   };
 
   outputs = [ "out" "dev" "man" ]