Ensure __set_errno is still visible on LP32.

The use of the .hidden directive to avoid going via the PLT for
__set_errno had the side-effect of actually making __set_errno
hidden (which is odd because assembler directives don't usually
affect symbols defined in a different file --- you can't even
create a weak reference to a symbol that's defined in a different
file).

This change switches the system call stubs over to a new always-hidden
__set_errno_internal and has a visible __set_errno on LP32 just for
binary compatibility with old NDK apps.

Bug: 17423135
Change-Id: I6b6d7a05dda85f923d22e5ffd169a91e23499b7b
diff --git a/libc/arch-x86_64/bionic/syscall.S b/libc/arch-x86_64/bionic/syscall.S
index d5694cb..87939ba 100644
--- a/libc/arch-x86_64/bionic/syscall.S
+++ b/libc/arch-x86_64/bionic/syscall.S
@@ -57,7 +57,7 @@
     jb      1f
     negl    %eax
     movl    %eax, %edi
-    call    __set_errno
+    call    __set_errno_internal
 1:
     ret
 END(syscall)