AK+Userland: Use a CMake variable for AK_SOURCES instead of GLOB

This lets us remove a glob pattern from LibC, the DynamicLoader, and,
later, Lagom. The Kernel already has its own separate list of AK files
that it wants, which is only a subset of all AK files.

AK/CMakeLists.txt

@@ -1,2 +1,34 @@
+set(AK_SOURCES
+    Assertions.cpp
+    Base64.cpp
+    FlyString.cpp
+    Format.cpp
+    FuzzyMatch.cpp
+    GenericLexer.cpp
+    Hex.cpp
+    JsonParser.cpp
+    JsonPath.cpp
+    JsonValue.cpp
+    kmalloc.cpp
+    LexicalPath.cpp
+    Random.cpp
+    StackInfo.cpp
+    String.cpp
+    StringBuilder.cpp
+    StringImpl.cpp
+    StringUtils.cpp
+    StringView.cpp
+    Time.cpp
+    URL.cpp
+    URLParser.cpp
+    Utf16View.cpp
+    Utf8View.cpp
+    UUID.cpp
+)
+# AK sources are included from many different places, such as the Kernel, LibC, and Loader
+list(TRANSFORM AK_SOURCES PREPEND "${CMAKE_CURRENT_SOURCE_DIR}/")
+
+set(AK_SOURCES ${AK_SOURCES} PARENT_SCOPE)
+
 serenity_install_headers(AK)
 serenity_install_sources(AK)

Userland/DynamicLoader/CMakeLists.txt

@@ -3,7 +3,6 @@ set(LOADER_SOURCES
     misc.cpp
 )
 
-file(GLOB AK_SOURCES "../../AK/*.cpp")
 file(GLOB ELF_SOURCES "../Libraries/LibELF/*.cpp")
 file(GLOB LIBC_SOURCES1 "../Libraries/LibC/*.cpp")
 file(GLOB LIBC_SOURCES2 "../Libraries/LibC/*/*.cpp")

Userland/Libraries/LibC/CMakeLists.txt

@@ -76,7 +76,6 @@ set(LIBC_SOURCES
     wstdio.cpp
 )
 
-file(GLOB AK_SOURCES CONFIGURE_DEPENDS "../../../AK/*.cpp")
 file(GLOB ELF_SOURCES CONFIGURE_DEPENDS "../LibELF/*.cpp")
 
 if ("${SERENITY_ARCH}" STREQUAL "aarch64")