nptl: turn pointer demangling off

Currently the stub calls would
demangle the pointer that is never mangled. Alternatively, we could sync
nptl/sysdeps/unix/sysv/linux/libc_pthread_init.c with new glibc version
that properly mangles the pointers, but that would need more validation
to make sure that all struct pthread_function readers do demangling.
uclibc currently does not do pointer mangling everywhere so it's more
consistent to just disable it here too.

Signed-off-by: Timo Teräs <timo.teras@iki.fi>
Signed-off-by: Austin Foxley <austinf@cetoncorp.com>

libpthread/nptl/sysdeps/pthread/pthread-functions.h

@@ -103,7 +103,7 @@ struct pthread_functions
 extern struct pthread_functions __libc_pthread_functions attribute_hidden;
 extern int __libc_pthread_functions_init attribute_hidden;
 
-#ifdef PTR_DEMANGLE
+#if 0
 # define PTHFCT_CALL(fct, params) \
   ({ __typeof (__libc_pthread_functions.fct) __p;			      \
      __p = __libc_pthread_functions.fct;				      \