Tests: Unify LibC tests to single location.

In a1720eed2a I added this new test,
but missed that there were already some "unit tests" for LibC over
in Userland/Tests/LibC. So lets unify these two locations.

Userland/DynamicLoader/CMakeLists.txt

@@ -8,8 +8,6 @@ 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")
-file(GLOB LIBC_TEST_SOURCES "../Libraries/LibC/Tests/*.cpp")
-list(REMOVE_ITEM LIBC_SOURCES2 ${LIBC_TEST_SOURCES})
 
 if ("${SERENITY_ARCH}" STREQUAL "i686")
     file(GLOB LIBC_SOURCES3 "../Libraries/LibC/arch/i386/*.S")

Userland/Libraries/LibC/CMakeLists.txt

@@ -1,5 +1,3 @@
-add_subdirectory(Tests)
-
 set(LIBC_SOURCES
     arpa/inet.cpp
     assert.cpp

Userland/Libraries/LibC/Tests/CMakeLists.txt

@@ -1,5 +0,0 @@
-file(GLOB TEST_SOURCES CONFIGURE_DEPENDS "*.cpp")
-
-foreach(source ${TEST_SOURCES})
-    serenity_test(${source} LibC)
-endforeach()

Userland/Tests/LibC/CMakeLists.txt

@@ -1,6 +1,11 @@
+set(TEST_SOURCES
+    ${CMAKE_CURRENT_SOURCE_DIR}/snprintf-correctness.cpp
+    ${CMAKE_CURRENT_SOURCE_DIR}/strlcpy-correctness.cpp
+    ${CMAKE_CURRENT_SOURCE_DIR}/TestLibCTime.cpp
+)
+
 file(GLOB CMD_SOURCES  CONFIGURE_DEPENDS "*.cpp")
-list(REMOVE_ITEM CMD_SOURCES ${CMAKE_CURRENT_SOURCE_DIR}/snprintf-correctness.cpp)
+list(REMOVE_ITEM CMD_SOURCES ${TEST_SOURCES})
-list(REMOVE_ITEM CMD_SOURCES ${CMAKE_CURRENT_SOURCE_DIR}/strlcpy-correctness.cpp)
 
 # FIXME: These tests do not use LibTest
 foreach(CMD_SRC ${CMD_SOURCES})
@@ -10,5 +15,6 @@ foreach(CMD_SRC ${CMD_SOURCES})
     install(TARGETS ${CMD_NAME} RUNTIME DESTINATION usr/Tests/LibC)
 endforeach()
 
-serenity_test(snprintf-correctness.cpp LibC)
+foreach(source ${TEST_SOURCES})
-serenity_test(strlcpy-correctness.cpp LibC)
+    serenity_test(${source} LibC)
+endforeach()