python: 2.7.14 -> 2.7.15 (bugfix + security)

Fixes CVE-2018-1000030, /cc #38993.

The ncurses patch no longer applied, and it appears the problems have
been resolved upstream https://bugs.python.org/issue25720
https://github.com/python/cpython/commit/6ba0b583d67

pkgs/development/interpreters/python/cpython/2.7/default.nix

@@ -31,7 +31,7 @@ with stdenv.lib;
 
 let
   majorVersion = "2.7";
-  minorVersion = "14";
+  minorVersion = "15";
   minorVersionSuffix = "";
   pythonVersion = majorVersion;
   version = "${majorVersion}.${minorVersion}${minorVersionSuffix}";
@@ -40,7 +40,7 @@ let
 
   src = fetchurl {
     url = "https://www.python.org/ftp/python/${majorVersion}.${minorVersion}/Python-${version}.tar.xz";
-    sha256 = "0rka541ys16jwzcnnvjp2v12m4cwgd2jp6wj4kj511p715pb5zvi";
+    sha256 = "0x2mvz9dp11wj7p5ccvmk9s0hzjk2fa1m462p395l4r6bfnb3n92";
   };
 
   hasDistutilsCxxPatch = !(stdenv.cc.isGNU or false);
@@ -58,8 +58,6 @@ let
       # if DETERMINISTIC_BUILD env var is set
       ./deterministic-build.patch
 
-      ./properly-detect-curses.patch
-
     ] ++ optionals (x11Support && stdenv.isDarwin) [
       ./use-correct-tcl-tk-on-darwin.patch
     ] ++ optionals stdenv.isLinux [