python3{5,6,7}: remove checkes for old compilers.

upstream@0fd65dbaa6516c1c354a109ecf97479645a8f1e2

closes #36.

Formula/python35.rb

@@ -3,7 +3,7 @@ class Python35 < Formula
   homepage "https://www.python.org/"
   url "https://www.python.org/ftp/python/3.5.6/Python-3.5.6.tar.xz"
   sha256 "f55cde04f521f273c7cba08912921cc5642cfc15ca7b22d5829f0aff4371155f"
-  revision 1
+  revision 2
 
   # setuptools remembers the build flags python is built with and uses them to
   # build packages later. Xcode-only systems need different flags.
@@ -28,11 +28,6 @@ class Python35 < Formula
   skip_clean "bin/pip3", "bin/pip-3.4", "bin/pip-3.5"
   skip_clean "bin/easy_install3", "bin/easy_install-3.4", "bin/easy_install-3.5"
 
-  fails_with :clang do
-    build 425
-    cause "https://bugs.python.org/issue24844"
-  end
-
   resource "setuptools" do
     url "https://pypi.org/packages/source/s/setuptools/setuptools-40.6.3.zip"
     sha256 "3b474dad69c49f0d2d86696b68105f3a6f195f7ab655af12ef9a9c326d2b08f8"

Formula/python36.rb

@@ -3,6 +3,7 @@ class Python36 < Formula
   homepage "https://www.python.org/"
   url "https://www.python.org/ftp/python/3.6.8/Python-3.6.8.tar.xz"
   sha256 "35446241e995773b1bed7d196f4b624dadcadc8429f26282e756b2fb8a351193"
+  revision 1
 
   # setuptools remembers the build flags python is built with and uses them to
   # build packages later. Xcode-only systems need different flags.
@@ -27,11 +28,6 @@ class Python36 < Formula
   skip_clean "bin/pip3", "bin/pip-3.4", "bin/pip-3.5", "bin/pip-3.6"
   skip_clean "bin/easy_install3", "bin/easy_install-3.4", "bin/easy_install-3.5", "bin/easy_install-3.6"
 
-  fails_with :clang do
-    build 425
-    cause "https://bugs.python.org/issue24844"
-  end
-
   resource "setuptools" do
     url "https://pypi.org/packages/source/s/setuptools/setuptools-40.6.3.zip"
     sha256 "3b474dad69c49f0d2d86696b68105f3a6f195f7ab655af12ef9a9c326d2b08f8"

Formula/python37.rb

@@ -3,6 +3,7 @@ class Python37 < Formula
   homepage "https://www.python.org/"
   url "https://www.python.org/ftp/python/3.7.2/Python-3.7.2.tar.xz"
   sha256 "d83fe8ce51b1bb48bbcf0550fd265b9a75cdfdfa93f916f9e700aef8444bf1bb"
+  revision 1
 
   # setuptools remembers the build flags python is built with and uses them to
   # build packages later. Xcode-only systems need different flags.
@@ -27,11 +28,6 @@ class Python37 < Formula
   skip_clean "bin/pip3", "bin/pip-3.4", "bin/pip-3.5", "bin/pip-3.6", "bin/pip-3.7"
   skip_clean "bin/easy_install3", "bin/easy_install-3.4", "bin/easy_install-3.5", "bin/easy_install-3.6", "bin/easy_install-3.7"
 
-  fails_with :clang do
-    build 425
-    cause "https://bugs.python.org/issue24844"
-  end
-
   resource "setuptools" do
     url "https://pypi.org/packages/source/s/setuptools/setuptools-40.6.3.zip"
     sha256 "3b474dad69c49f0d2d86696b68105f3a6f195f7ab655af12ef9a9c326d2b08f8"