DynamicLoader: Remove -fbuilding-libgcc hack

This won't be necessary anymore after a toolchain rebuild.

Userland/DynamicLoader/CMakeLists.txt

@@ -26,8 +26,7 @@ add_definitions(-D_DYNAMIC_LOADER)
 
 set(SOURCES ${LOADER_SOURCES} ${AK_SOURCES} ${ELF_SOURCES} ${LIBC_SOURCES1} ${LIBC_SOURCES2} ${LIBC_SOURCES3} ${LIBSYSTEM_SOURCES})
 
-# FIXME: Remove -fbuilding-libgcc after the next toolchain update
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fbuilding-libgcc -fno-rtti -nostdlib -pie -fpic -DNO_TLS")
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-rtti -nostdlib -pie -fpic -DNO_TLS")
 
 set_source_files_properties (../Libraries/LibC/ssp.cpp PROPERTIES COMPILE_FLAGS
     "-fno-stack-protector")