Make sure that the PTRACE_... symbols are available for ppc/plt.c.

On a Fedora 12 x86_64 build/host box, this file was complaining about
PTRACE_PEEKTEXT being undefined. Adding in the "ptrace.h" include
fixed it.

Signed-off-by: Anthony Foiani <anthony.foiani@gmail.com>

This is NOT the official version of dialog.  This version has been

significantly modified from the original.  It is for use by the Linux

kernel configuration script.  Please do not bother Savio Lam with 

questions about this program.