libc: remove ctors/dtors sections

None of the supported ARCHs actually populate these sections,
so there is no point in keeping them in the binaries.

Change-Id: I21a364f510118ac1114e1b49c53ec8c895c6bc6b
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@gmail.com>

libc/bionic/libc_init_common.h

@@ -35,9 +35,6 @@ typedef struct
     void (**preinit_array)(void);
     void (**init_array)(void);
     void (**fini_array)(void);
-#ifndef __i386__
-    void (**ctors_array)(void);
-#endif
 } structors_array_t;
 
 extern void __libc_init_common(uintptr_t *elfdata);