qt5: Add patch for Secure Transport issues with QtWebKit.

Closes Homebrew/homebrew#46057.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>

Formula/qt5.rb

@@ -15,7 +15,7 @@ class Qt5 < Formula
   desc "Version 5 of the Qt framework"
   homepage "https://www.qt.io/"
   head "https://code.qt.io/qt/qt5.git", :branch => "5.5", :shallow => false
-  revision 1
+  revision 2
 
   stable do
     url "https://download.qt.io/official_releases/qt/5.5/5.5.1/single/qt-everywhere-opensource-src-5.5.1.tar.xz"
@@ -43,6 +43,16 @@ class Qt5 < Formula
       url "https://raw.githubusercontent.com/UniqMartin/patches/77d138fa/qt5/osx-no-rpath.patch"
       sha256 "92c9cfe701f9152f4b16219a04a523338d4b77bb0725a8adccc3fc72c9fb576f"
     end
+
+    # Fixes for Secure Transport in QtWebKit
+    # https://codereview.qt-project.org/#/c/139967/
+    # https://codereview.qt-project.org/#/c/139968/
+    # https://codereview.qt-project.org/#/c/139970/
+    # Should land in the 5.5.2 and/or 5.6 release.
+    patch do
+      url "https://gist.githubusercontent.com/The-Compiler/8202f92fff70da39353a/raw/884c3bef4d272d25d7d7202be99c3940248151ee/qt5.5-securetransport-qtwebkit.patch"
+      sha256 "c3302de2e23e74a99e62f22527e0edee5539b2e18d34c05e70075490ba7b3613"
+    end
   end
 
   bottle do