File dtkwidget-fix-lost-pkgconfig.patch of Package dtkwidget

diff -Nur dtkwidget-2.0.7.1/src/platforms/x11/x11.pri dtkwidget-2.0.7.1-new/src/platforms/x11/x11.pri
--- dtkwidget-2.0.7.1/src/platforms/x11/x11.pri	2018-03-12 13:04:26.000000000 +0800
+++ dtkwidget-2.0.7.1-new/src/platforms/x11/x11.pri	2018-03-20 11:04:57.219813746 +0800
@@ -1,3 +1,5 @@
+PKGCONFIG += x11 xext
+
 HEADERS += \
     $$PWD/xutil.h