Revert "sparc: use HIDDEN_JUMPTARGET for errno"

Revert "sparc: use HIDDEN_JUMPTARGET for errno"

This reverts commit f51fb26dbcceee9e48d10facc830bd4a549f6cc2.

This fixes linking error for sparc build.
While building a sparc system you get following linking error:
libc/sysdeps/linux/sparc/pipe.S:54: undefined reference to `__GI___errno_location'

Removing the HIDDEN_JUMPTARGET fixes the issue, while using gcc 4.8.3/binutils 2.24.

The definition of __errno_location was changed recently here:
http://git.uclibc.org/uClibc/commit/?id=8f550715c2b211036fc273add3cb5219397ed312

Signed-off-by: Waldemar Brodkorb <wbx@openadk.org>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>