Clean up the argc/argv/envp/auxv handling.

There's now only one place where we deal with this stuff, it only needs to
be parsed once by the dynamic linker (rather than by each recipient), and it's
now easier for us to get hold of auxv data early on.

Change-Id: I6314224257c736547aac2e2a650e66f2ea53bef5
diff --git a/libc/private/bionic_tls.h b/libc/private/bionic_tls.h
index f661ccf..920f506 100644
--- a/libc/private/bionic_tls.h
+++ b/libc/private/bionic_tls.h
@@ -134,7 +134,7 @@
 extern void*  __get_stack_base(int  *p_stack_size);
 
 /* Initialize the TLS. */
-extern void __libc_init_tls(unsigned** elfdata);
+extern void __libc_init_tls(void* kernel_argument_block);
 
 __END_DECLS