AK: Make the AK library's CMake a bit more standard

We no longer have multiple locations including AK (e.g. LibC). So let's
avoid awkwardly defining the AK library across multiple CMake files.

This is to allow more easily adding third-party dependencies to AK in
the future.

AK/CMakeLists.txt

@@ -1,4 +1,4 @@
-set(AK_SOURCES
+set(SOURCES
     Assertions.cpp
     Base64.cpp
     CircularBuffer.cpp
@@ -37,10 +37,22 @@ set(AK_SOURCES
     Utf8View.cpp
     kmalloc.cpp
 )
-# AK sources are included from many different places
-list(TRANSFORM AK_SOURCES PREPEND "${CMAKE_CURRENT_SOURCE_DIR}/")
 
-set(AK_SOURCES ${AK_SOURCES} PARENT_SCOPE)
+serenity_lib(AK ak)
 
 serenity_install_headers(AK)
 serenity_install_sources(AK)
+
+find_package(Backtrace)
+configure_file(Backtrace.h.in Backtrace.h @ONLY)
+
+if (Backtrace_FOUND)
+    if (CMAKE_VERSION VERSION_GREATER_EQUAL 3.30)
+        target_link_libraries(AK PRIVATE Backtrace::Backtrace)
+    else()
+        target_include_directories(AK PRIVATE ${Backtrace_INCLUDE_DIRS})
+        target_link_libraries(AK PRIVATE ${Backtrace_LIBRARIES})
+    endif()
+else()
+    message(WARNING "Backtrace not found, stack traces will be unavailable")
+endif()

Meta/Lagom/CMakeLists.txt

@@ -327,19 +327,6 @@ install(TARGETS LibC LibCrypt NoCoverage EXPORT LagomTargets)
 
 # AK
 add_serenity_subdirectory(AK)
-lagom_lib(AK ak SOURCES ${AK_SOURCES})
-find_package(Backtrace)
-configure_file(../../AK/Backtrace.h.in AK/Backtrace.h @ONLY)
-if (Backtrace_FOUND)
-    if (CMAKE_VERSION VERSION_GREATER_EQUAL 3.30)
-        target_link_libraries(AK PRIVATE Backtrace::Backtrace)
-    else()
-        target_include_directories(AK PRIVATE ${Backtrace_INCLUDE_DIRS})
-        target_link_libraries(AK PRIVATE ${Backtrace_LIBRARIES})
-    endif()
-else()
-    message(WARNING "Backtrace not found, stack traces will be unavailable")
-endif()
 
 # LibCoreMinimal
 add_serenity_subdirectory(Userland/Libraries/LibCore)