Add missing Qt5Concurrent to target_link_libraries

This was working as long as it was implicitly provided by KIO.
Other backends are fine.

Fixes:
- DiscoverCommon w/ AppStreamQt
- packagekit-backend

See also: frameworks/kio!426

Signed-off-by: Andreas Sturmlechner <asturm@gentoo.org>

libdiscover/CMakeLists.txt

@@ -48,7 +48,7 @@ if(TARGET AppStreamQt)
         appstream/AppStreamIntegration.cpp
         appstream/AppStreamUtils.cpp
     )
-    target_link_libraries(DiscoverCommon PRIVATE AppStreamQt)
+    target_link_libraries(DiscoverCommon PRIVATE Qt5::Concurrent AppStreamQt)
 
     if(AppStreamQt_VERSION VERSION_GREATER 0.12.4)
         target_compile_definitions(DiscoverCommon PRIVATE -DAPPSTREAM_HAS_SPDX=1)

libdiscover/backends/PackageKitBackend/CMakeLists.txt

@@ -19,7 +19,7 @@ ecm_qt_declare_logging_category(packagekit-backend_SRCS HEADER libdiscover_backe
 
 add_library(packagekit-backend MODULE ${packagekit-backend_SRCS})
 
-target_link_libraries(packagekit-backend PRIVATE Discover::Common Qt5::Core PK::packagekitqt5 KF5::ConfigGui KF5::KIOCore KF5::Archive AppStreamQt)
+target_link_libraries(packagekit-backend PRIVATE Discover::Common Qt5::Core Qt5::Concurrent PK::packagekitqt5 KF5::ConfigGui KF5::KIOCore KF5::Archive AppStreamQt)
 install(TARGETS packagekit-backend DESTINATION ${PLUGIN_INSTALL_DIR}/discover)
 
 if(TARGET PkgConfig::Markdown)