gdbgui: reorder

pkgs/development/tools/misc/gdbgui/default.nix

@@ -7,10 +7,20 @@
 
 python3Packages.buildPythonApplication (finalAttrs: {
   pname = "gdbgui";
-
   version = "0.15.3.0";
   pyproject = true;
 
+  src = fetchPypi {
+    inherit (finalAttrs) pname version;
+    hash = "sha256-/HyFE0JnoN03CDyCQCo/Y9RyH4YOMoeB7khReIb8t7Y=";
+  };
+
+  postPatch = ''
+    echo ${finalAttrs.version} > gdbgui/VERSION.txt
+    # relax version requirements
+    sed -i 's/==.*$//' requirements.txt
+  '';
+
   build-system = with python3Packages; [ setuptools ];
 
   buildInputs = [ gdb ];
@@ -23,17 +33,6 @@ python3Packages.buildPythonApplication (finalAttrs: {
     pygments
   ];
 
-  src = fetchPypi {
-    inherit (finalAttrs) pname version;
-    hash = "sha256-/HyFE0JnoN03CDyCQCo/Y9RyH4YOMoeB7khReIb8t7Y=";
-  };
-
-  postPatch = ''
-    echo ${finalAttrs.version} > gdbgui/VERSION.txt
-    # relax version requirements
-    sed -i 's/==.*$//' requirements.txt
-  '';
-
   postInstall = ''
     wrapProgram $out/bin/gdbgui \
       --prefix PATH : ${lib.makeBinPath [ gdb ]}