Arch-abstraction:
- create coregrind/x86-linux/ directory.
- move vg_unistd.h into x86-linux/, because it's platform-dependent.  Also
  rename it as vki_unistd.h to make clear it's a kernel interface thing.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@2681 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/README_MISSING_SYSCALL_OR_IOCTL b/README_MISSING_SYSCALL_OR_IOCTL
index a67fe06..ad91925 100644
--- a/README_MISSING_SYSCALL_OR_IOCTL
+++ b/README_MISSING_SYSCALL_OR_IOCTL
@@ -96,7 +96,7 @@
        grep NNN /usr/include/asm/unistd.h
 
     This should tell you something like  __NR_mysyscallname.
-    Copy this entry to coregrind/vg_unistd.h.
+    Copy this entry to coregrind/$(VG_PLATFORM)/vki_unistd.h.
 
 2.  Do 'man 2 mysyscallname' to get some idea of what the syscall
     does.  Note that the actual kernel interface can differ from this,