remove unneeded patch of qhttpengine

This patch was needed when MXE used system cmake. The patch enabled
cmake 2.8.9 to work. Currently we use cmake 3.5.2 shipped with MXE.

src/qhttpengine-1-decrease-required-cmake-ver.patch

@@ -1,50 +0,0 @@
-This file is part of MXE. See LICENSE.md for licensing information.
-
-From ecc6fd682b2bef9aca06ce3f8ac3e6178faf4640 Mon Sep 17 00:00:00 2001
-From: Boris Nagaev <bnagaev@gmail.com>
-Date: Sun, 6 Sep 2015 03:45:19 +0200
-Subject: [PATCH] decrease required cmake ver.
-
-2.8.11 -> 2.8.9
-
-Debian Wheezy has CMake version 2.8.9
-
-To make it possible, CMake command target_include_directories
-was replaced with command include_directories.
----
- CMakeLists.txt     |    2 +-
- src/CMakeLists.txt |    8 +++-----
- 2 files changed, 4 insertions(+), 6 deletions(-)
-
-diff --git a/CMakeLists.txt b/CMakeLists.txt
-index ec32cd8..0e7ba11 100644
---- a/CMakeLists.txt
-+++ b/CMakeLists.txt
-@@ -1,4 +1,4 @@
--cmake_minimum_required(VERSION 2.8.11)
-+cmake_minimum_required(VERSION 2.8.9)
- project(QHttpEngine)
- 
- if(NOT (CMAKE_MAJOR_VERSION VERSION_LESS 3))
-diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
-index 83f9a4c..0313dc3 100644
---- a/src/CMakeLists.txt
-+++ b/src/CMakeLists.txt
-@@ -28,11 +28,9 @@ endif()
- 
- qt5_use_modules(QHttpEngine Network)
- 
--target_include_directories(QHttpEngine PUBLIC
--    "$<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>"
--    "$<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}>"
--    "$<INSTALL_INTERFACE:${INCLUDE_INSTALL_DIR}>"
--)
-+include_directories(${CMAKE_CURRENT_SOURCE_DIR})
-+include_directories(${CMAKE_CURRENT_BINARY_DIR})
-+include_directories(${INCLUDE_INSTALL_DIR})
- 
- set_target_properties(QHttpEngine PROPERTIES
-     DEFINE_SYMBOL QT_NO_SIGNALS_SLOTS_KEYWORDS
--- 
-1.7.10.4
-