CMake build/Linux: Install desktop and appstream files

Fixes: QTCREATORBUG-23906
Change-Id: I9d796c8826dbb4beb980aa29b75526fe96093921
Reviewed-by: Cristian Adam <cristian.adam@qt.io>

qtcreator.pro

@@ -98,10 +98,10 @@ BASENAME = $$(INSTALL_BASENAME)
 isEmpty(BASENAME): BASENAME = qt-creator-$${PLATFORM}$(INSTALL_EDITION)-$${QTCREATOR_VERSION}$(INSTALL_POSTFIX)
 
 linux {
-    appstream.files = dist/org.qt-project.qtcreator.appdata.xml
+    appstream.files = share/metainfo/org.qt-project.qtcreator.appdata.xml
     appstream.path = $$QTC_PREFIX/share/metainfo/
 
-    desktop.files = dist/org.qt-project.qtcreator.desktop
+    desktop.files = share/applications/org.qt-project.qtcreator.desktop
     desktop.path = $$QTC_PREFIX/share/applications/
 
     INSTALLS += appstream desktop

share/CMakeLists.txt

@@ -1 +1,11 @@
 add_subdirectory(qtcreator)
+
+if (NOT APPLE AND NOT WIN32)
+  install(
+    DIRECTORY
+      applications
+      metainfo
+    DESTINATION
+      share
+  )
+endif()