syscall.c: move inclusion of arch specific files to the end of file
syscall.c: move inclusion of arch specific files to the end of file

Move inclusion of arch specific files that define static functions to
the end of syscall.c.

* syscall.c (get_syscall_result_regs, get_error, getregs_old):
New forward declarations.
(arch_get_scno): Move forward.
Move inclusion of "get_scno.c", "get_syscall_args.c",
"get_syscall_result.c", "get_error.c", and "getregs_old.c"
to the end of file.

cuviper/strace,cuviper/strace,kapdop/android_external_strace,vrastogi/strace,cuviper/strace,Distrotech/strace,Saruta/strace,kapdop/android_external_strace,vrastogi/strace,Saruta/strace,cuviper/strace,Saruta/strace,vrastogi/strace,kapdop/android_external_strace,Distrotech/strace,kapdop/android_external_strace,Saruta/strace,vrastogi/strace,Distrotech/strace,Distrotech/strace,vrastogi/strace,Saruta/strace,kapdop/android_external_strace,cuviper/strace,Distrotech/strace