Meta: Exclude LibCore, LibUnicode, and LibURL from the lagom-tools build

We only need LibCoreMinimal for the lagom-tools build. In particular, by
removing LibUnicode, we remove the lagom-tools dependence on the system
ICU package, as we do not have vcpkg hooked into this build. (We could
probably add vcpkg here, but since this libraries aren't even needed, we
don't need to bother).

(cherry picked from commit c9d9e1bb1f968165940f60d6b4b6ea0e32d1a027;
amended to fix conflicts due to cmake lists being pretty different,
in part to to us not having LadybirdBrowser/ladybird#105)

Meta/Lagom/CMakeLists.txt

@@ -380,26 +380,12 @@ if (Backtrace_FOUND AND NOT "${Backtrace_LIBRARIES}" STREQUAL "")
     target_include_directories(AK PRIVATE ${Backtrace_INCLUDE_DIRS})
 endif()
 
-add_serenity_subdirectory(Userland/Libraries/LibUnicode)
-add_serenity_subdirectory(Userland/Libraries/LibURL)
-
-# LibCore
+# LibCoreMinimal
 add_serenity_subdirectory(Userland/Libraries/LibCore)
-target_link_libraries(LibCore PRIVATE Threads::Threads)
 if (${CMAKE_SYSTEM_NAME} MATCHES "NetBSD")
     # NetBSD has its shm_open and shm_unlink functions in librt so we need to link that
-    target_link_libraries(LibCore PRIVATE rt)
     target_link_libraries(LibCoreMinimal PRIVATE rt)
 endif()
-if (${CMAKE_SYSTEM_NAME} MATCHES "SunOS")
-    # Solaris has socket and networking related functions in two extra libraries
-    target_link_libraries(LibCore PRIVATE nsl socket)
-endif()
-if (HAIKU)
-    # Haiku has networking related functions in the network library
-    target_link_libraries(LibCore PRIVATE network)
-endif()
-target_link_libraries(LibCore PRIVATE LibURL)
 
 # LibMain
 add_serenity_subdirectory(Userland/Libraries/LibMain)
@@ -508,11 +494,27 @@ if (BUILD_LAGOM)
         TextCodec
         Threading
         TLS
+        Unicode
+        URL
         Wasm
         WebSocket
         XML
     )
 
+    target_link_libraries(LibCore PRIVATE LibURL Threads::Threads)
+    if (${CMAKE_SYSTEM_NAME} MATCHES "NetBSD")
+        # NetBSD has its shm_open and shm_unlink functions in librt so we need to link that
+        target_link_libraries(LibCore PRIVATE rt)
+    endif()
+    if (${CMAKE_SYSTEM_NAME} MATCHES "SunOS")
+        # Solaris has socket and networking related functions in two extra libraries
+        target_link_libraries(LibCore PRIVATE nsl socket)
+    endif()
+    if (HAIKU)
+        # Haiku has networking related functions in the network library
+        target_link_libraries(LibCore PRIVATE network)
+    endif()
+
     # These are needed for both LibWeb and LibProtocol.
     compile_ipc(${SERENITY_PROJECT_ROOT}/Userland/Services/RequestServer/RequestClient.ipc Userland/Services/RequestServer/RequestClientEndpoint.h)
     compile_ipc(${SERENITY_PROJECT_ROOT}/Userland/Services/RequestServer/RequestServer.ipc Userland/Services/RequestServer/RequestServerEndpoint.h)

Userland/Libraries/LibCore/CMakeLists.txt

@@ -17,6 +17,10 @@ set(SOURCES
 serenity_lib(LibCoreMinimal coreminimal)
 target_link_libraries(LibCoreMinimal PRIVATE LibSystem)
 
+if (NOT BUILD_LAGOM AND NOT SERENITYOS)
+    return()
+endif()
+
 if (SERENITYOS)
     add_library(DynamicLoader_LibCoreArgsParser 
         ArgsParser.cpp