treewide: change pythonForBuild to pythonOnBuildForHost

pkgs/development/python2-modules/bootstrapped-pip/default.nix

@@ -45,17 +45,17 @@ stdenv.mkDerivation rec {
 
     echo "Building setuptools wheel..."
     pushd setuptools
-    ${python.pythonForBuild.interpreter} -m pip install --no-build-isolation --no-index --prefix=$out  --ignore-installed --no-dependencies --no-cache .
+    ${python.pythonOnBuildForHost.interpreter} -m pip install --no-build-isolation --no-index --prefix=$out  --ignore-installed --no-dependencies --no-cache .
     popd
 
     echo "Building wheel wheel..."
     pushd wheel
-    ${python.pythonForBuild.interpreter} -m pip install --no-build-isolation --no-index --prefix=$out  --ignore-installed --no-dependencies --no-cache .
+    ${python.pythonOnBuildForHost.interpreter} -m pip install --no-build-isolation --no-index --prefix=$out  --ignore-installed --no-dependencies --no-cache .
     popd
 
     echo "Building pip wheel..."
     pushd pip
-    ${python.pythonForBuild.interpreter} -m pip install --no-build-isolation --no-index --prefix=$out  --ignore-installed --no-dependencies --no-cache .
+    ${python.pythonOnBuildForHost.interpreter} -m pip install --no-build-isolation --no-index --prefix=$out  --ignore-installed --no-dependencies --no-cache .
     popd
   '';
 

pkgs/development/python2-modules/pycairo/default.nix

@@ -42,7 +42,7 @@ buildPythonPackage rec {
     # This is only used for figuring out what version of Python is in
     # use, and related stuff like figuring out what the install prefix
     # should be, but it does need to be able to execute Python code.
-    "-Dpython=${python.pythonForBuild.interpreter}"
+    "-Dpython=${python.pythonOnBuildForHost.interpreter}"
   ];
 
   meta = with lib; {

pkgs/development/python2-modules/setuptools/default.nix

@@ -29,8 +29,8 @@ let
     ];
 
     buildPhase = ''
-      ${python.pythonForBuild.interpreter} bootstrap.py
-      ${python.pythonForBuild.interpreter} setup.py sdist --formats=gztar
+      ${python.pythonOnBuildForHost.interpreter} bootstrap.py
+      ${python.pythonOnBuildForHost.interpreter} setup.py sdist --formats=gztar
 
       # Here we untar the sdist and retar it in order to control the timestamps
       # of all the files included