restructure code for future fixing of 123837 (semctl GETVAL false positive)

Regrouped identical code (except for indentation)
from syswrap-ppc64-linux.c, syswrap-ppc32-linux.c,syswrap-mips32-linux.c
  syswrap-x86-linux.c, syswrap-s390x-linux.c
into
  syswrap-linux.c

(compiled/regtested on x86, amd64, ppc64, mips32, s390x)



git-svn-id: svn://svn.valgrind.org/valgrind/trunk@13076 a5019735-40e9-0310-863c-91ae7b9d1cf9
8 files changed