arch/arc: Remove redundant __cxa_atexit from MWDT stubs

__cxa_atexit was originally defined by the IA64 C++ ABI, but it has been
adopted by other C++ implementations since then.  This function is already
present in lib/cpp/api/cpp_dtors.c, which is built by default when C++
support is enabled, so we don't need another copy in the MWDT-specific
code.

Signed-off-by: Keith Packard <[email protected]>

Author: keith-packard

arch/arc/arcmwdt/arcmwdt-dtr-stubs.c

@@ -8,14 +8,6 @@
 
 __weak void *__dso_handle;
 
-int __cxa_atexit(void (*destructor)(void *), void *objptr, void *dso)
-{
-	ARG_UNUSED(destructor);
-	ARG_UNUSED(objptr);
-	ARG_UNUSED(dso);
-	return 0;
-}
-
 int atexit(void (*function)(void))
 {
 	return 0;