Remove 32-bit assumptions from the ELF code.

Change-Id: I2c1f3d34c33685799aade8866eec44479ff9f963
diff --git a/libc/private/bionic_auxv.h b/libc/private/bionic_auxv.h
index 23b2e37..69c5341 100644
--- a/libc/private/bionic_auxv.h
+++ b/libc/private/bionic_auxv.h
@@ -33,7 +33,7 @@
 
 __BEGIN_DECLS
 
-extern Elf32_auxv_t* __libc_auxv;
+extern Elf_auxv_t* __libc_auxv;
 
 __END_DECLS