cmake: fix Qt resources linkage. Closes #5080

Qt resource is innitialized by a static object constructor (see
https://wiki.qt.io/QtResources). When we put resources into a static
library, the linker removes that static objects and thus the resources
themselves. To correct that we append resources to the main executable
sources list. This is done via custom function qbt_target_sources which
knows where to read the executable' name.

src/app/CMakeLists.txt

@@ -1,3 +1,4 @@
+project(qbt_executable)
 include_directories(${CMAKE_CURRENT_BINARY_DIR})
 
 set(QBT_APP_HEADERS
@@ -86,13 +87,10 @@ list(APPEND QBT_APP_HEADERS upgrade.h)
 list(APPEND QBT_TARGET_LIBRARIES qbt_base)
 
 if (GUI)
-    set(QBT_TARGET_NAME qbittorrent)
     list(APPEND QBT_TARGET_LIBRARIES qbt_searchengine qbt_gui)
     include_directories(../gui
         ${CMAKE_CURRENT_BINARY_DIR}/../gui
     )
-else (GUI)
-    set(QBT_TARGET_NAME qbittorrent-nox)
 endif (GUI)
 
 if (WEBUI)
@@ -152,6 +150,7 @@ add_executable(${QBT_TARGET_NAME} ${QBT_APP_HEADERS} ${QBT_APP_SOURCES} ${QBT_QM
 set_target_properties(${QBT_TARGET_NAME}
     PROPERTIES
         AUTOUIC True
+        AUTORCC True
         MACOSX_BUNDLE True
 )