SuperBuild: patch for jpeg detection on windows

SuperBuild/patches/QT5/qt5-1-jpeg-detection-win.diff

+--- qt-everywhere-src-5.10.1/qtbase/src/gui/configure.json	2018-02-08 19:24:48.000000000 +0100
++++ QT5/qtbase/src/gui/configure.json	2018-04-10 11:50:15.631526687 +0200
+@@ -278,8 +278,7 @@
+                 "main": "jpeg_create_compress(cinfo);"
+             },
+             "sources": [
+-                { "libs": "-llibjpeg", "condition": "config.msvc" },
+-                { "libs": "-ljpeg", "condition": "!config.msvc" }
++                { "libs": "-ljpeg" }
+             ]
+         },
+         "libpng": {