Bump ui/qt to 5.15.2

.orchestra/config/components/ui/qt.yml

@@ -67,8 +67,7 @@
     -opengl desktop \
     -egl \
     -no-eglfs \
-    -xkb \
-    -system-xcb \
+    -xcb \
     -xkbcommon \
     -no-icu \
     -no-zstd \
@@ -106,7 +105,7 @@ builds:
   #@ ndebug = opts["ndebug"]
   (@= flavor @):
     configure: |
-      extract.sh --into "$SOURCE_DIR" https://download.qt.io/official_releases/qt/5.14/5.14.1/single/qt-everywhere-src-5.14.1.tar.xz
+      extract.sh --into "$SOURCE_DIR" https://download.qt.io/official_releases/qt/5.15/5.15.2/single/qt-everywhere-src-5.15.2.tar.xz
       patch-if-exists "${ORCHESTRA_DOTDIR}/patches/qt-5.13.1-libcxx-include-array-linuxdmabuf.patch" "$SOURCE_DIR"
 
       sed -i 's|QT_CONFIG(getauxval)|0|' "$SOURCE_DIR/qtbase/src/corelib/global/qrandom.cpp"