CMake: Restore Thai plug-in to not needing to link to westernsupport

Link the language plugins to the common library as they should have been,
and remove the abstractlanguageplugin.{cpp,h} from westernsupport as they
are already included in the keyboard library, linked by common. This allows
for languages using AbstractLanguagePlugin, but which don't need to link
against westersupport, such as Thai, to be built properly again.

CMakeLists.txt

@@ -80,9 +80,7 @@ set(WESTERNSUPPORT_SOURCES
         plugins/westernsupport/westernlanguagesplugin.h
         plugins/westernsupport/westernsupport.cpp
         plugins/westernsupport/westernsupport.h
-        plugins/westernsupport/westernsupport_global.h
-        src/lib/logic/abstractlanguageplugin.cpp
-        src/lib/logic/abstractlanguageplugin.h)
+        plugins/westernsupport/westernsupport_global.h)
 
 # TODO install logic/languageplugininterface.h and logic/abstractplugininterface.h as HEADERS
 
@@ -215,7 +213,7 @@ if(enable-presage)
     list(APPEND PLUGIN_SOURCES database_${_language}.db)
 endif()
     add_library(${_language}plugin MODULE ${PLUGIN_SOURCES})
-    target_link_libraries(${_language}plugin westernsupport)
+    target_link_libraries(${_language}plugin maliit-keyboard-common westernsupport)
     install(FILES plugins/${_language}/qml/Keyboard_${_language}.qml
             plugins/${_language}/qml/Keyboard_${_language}_email.qml
             plugins/${_language}/qml/Keyboard_${_language}_url.qml
@@ -279,7 +277,7 @@ function(abstract_language_plugin _language _full_language)
         list(APPEND PLUGIN_SOURCES database_${_language}.db)
     endif()
     add_library(${_target}plugin MODULE ${PLUGIN_SOURCES})
-    target_link_libraries(${_target}plugin Qt5::Core Maliit::Plugins ${abstract_language_plugin_LIBRARIES})
+    target_link_libraries(${_target}plugin Qt5::Core Maliit::Plugins maliit-keyboard-common ${abstract_language_plugin_LIBRARIES})
     target_include_directories(${_target}plugin PRIVATE src/lib/logic ${abstract_language_plugin_INCLUDE_DIRS})
     target_compile_definitions(${_target}plugin PRIVATE ${abstract_language_plugin_DEFINITIONS})
     install(TARGETS ${_target}plugin
@@ -344,7 +342,7 @@ abstract_language_plugin(en@dv englishdvorak
     FILES src/overrides.csv
     LIBRARIES westernsupport)
 abstract_language_plugin(fr-ch french LIBRARIES westernsupport)
-abstract_language_plugin(th thai LIBRARIES westernsupport DIRECTORY qml/keys)
+abstract_language_plugin(th thai DIRECTORY qml/keys)
 
 if(Anthy_FOUND)
     abstract_language_plugin(ja japanese ABSTRACT_LANGUAGE_PLUGIN