tauon: fix build error

If the interpreter path to bash after patchShebang contians the string
'gcc', then we will end up mangaling the shebang interpreter path with
the substituteInPlace on 'gcc' that follows the patchShebang.

We can fix this by switching the order of the two, but since this script
is only used once during compilation, it's simplier just to call bash
directly to run the script.

pkgs/applications/audio/tauon/default.nix

@@ -58,15 +58,13 @@ stdenv.mkDerivation (finalAttrs: {
     substituteInPlace t_modules/t_phazor.py \
       --replace 'lib/libphazor.so' '../../lib/libphazor.so'
 
-    patchShebangs compile-phazor.sh
-
     substituteInPlace compile-phazor.sh --replace 'gcc' '${stdenv.cc.targetPrefix}cc'
 
     substituteInPlace extra/tauonmb.desktop --replace 'Exec=/opt/tauon-music-box/tauonmb.sh' 'Exec=${placeholder "out"}/bin/tauon'
   '';
 
   postBuild = ''
-    ./compile-phazor.sh
+    bash ./compile-phazor.sh
   '';
 
   nativeBuildInputs = [