message: [Doc] Update Windows mingw build doc Qt URLs
  The URL for the referenced Qt download files have changed, updating to
  new URLs.
  NOTE: Version referenced is not changed, just the download URLs.
diff: @@ -160,8 +160,8 @@ make
  2.7 Qt 5 libraries:
  Qt must be configured with ssl and zlib support.
  Download and unpack Qt base and tools sources:
  -http://download.qt-project.org/official_releases/qt/5.3/5.3.2/submodules/qtbase-opensource-src-5.3.2.7z
  -http://download.qt-project.org/official_releases/qt/5.3/5.3.2/submodules/qttools-opensource-src-5.3.2.7z
  +http://download.qt-project.org/archive/qt/5.3/5.3.2/submodules/qtbase-opensource-src-5.3.2.7z
  +http://download.qt-project.org/archive/qt/5.3/5.3.2/submodules/qttools-opensource-src-5.3.2.7z
  Then from a windows command prompt (note that the following assumes qtbase has been unpacked to C:\deps\Qt\5.3.2 and
  qttools have been unpacked to C:\deps\Qt\qttools-opensource-src-5.3.2):
  