[CVE-2009-0029] Remove __attribute__((weak)) from sys_pipe/sys_pipe2

[CVE-2009-0029] Remove __attribute__((weak)) from sys_pipe/sys_pipe2

Remove __attribute__((weak)) from common code sys_pipe implemantation.
IA64, ALPHA, SUPERH (32bit) and SPARC (32bit) have own implemantations
with the same name. Just rename them.
For sys_pipe2 there is no architecture specific implementation.

Cc: Richard Henderson <[email protected]>
Cc: David S. Miller <[email protected]>
Cc: Paul Mundt <[email protected]>
Cc: Tony Luck <[email protected]>
Signed-off-by: Heiko Carstens <[email protected]>