sim/ppc: make defines.h sed command portable

When building on macOS, whose sed is the BSD one, I get:

      GEN      ppc/stamp-defines
    sed: 1: "/^#define HAVE_.*1$/{ s ...": extra characters at the end of p command
    make[1]: *** [ppc/stamp-defines] Error 1

BSD sed apparently does not accept a `}' directly after another command,
it needs a separating semicolon.  Add one after the `p'.  GNU sed
accepts both forms, and produces the same output either way.

Re-generate sim/Makefile.in.

Change-Id: I0709ad7b0051e08299f2576113b549aba9fc703f
Approved-By: Andrew Burgess <aburgess@redhat.com>