bpo-42504: Ensure that get_config_var('MACOSX_DEPLOYMENT_TARGET') is a string (GH-24341)

* bpo-42504: Ensure that get_config_var('MACOSX_DEPLOYMENT_TARGET') is a string

Author: ronaldoussoren

distutils/tests/test_build_ext.py

@@ -456,7 +456,7 @@ def test_deployment_target_higher_ok(self):
  deptarget = sysconfig.get_config_var('MACOSX_DEPLOYMENT_TARGET')
  if deptarget:
  # increment the minor version number (i.e. 10.6 -> 10.7)
- deptarget = [int(x) for x in str(deptarget).split('.')]
+ deptarget = [int(x) for x in deptarget.split('.')]
  deptarget[-1] += 1
  deptarget = '.'.join(str(i) for i in deptarget)
  self._try_compile_deployment_target('<', deptarget)
@@ -489,7 +489,7 @@ def _try_compile_deployment_target(self, operator, target):
 
  # get the deployment target that the interpreter was built with
  target = sysconfig.get_config_var('MACOSX_DEPLOYMENT_TARGET')
- target = tuple(map(int, str(target).split('.')[0:2]))
+ target = tuple(map(int, target.split('.')[0:2]))
  # format the target value as defined in the Apple
  # Availability Macros. We can't use the macro names since
  # at least one value we test with will not exist yet.