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/coregrind/core.h b/coregrind/core.h
index 12285de..bce17e3 100644
--- a/coregrind/core.h
+++ b/coregrind/core.h
@@ -81,7 +81,7 @@
 
 
 /* For system call numbers __NR_... */
-#include "vg_unistd.h"
+#include "vki_unistd.h"
 
 #include "core_asm.h"      // asm stuff
 #include "tool.h"          // tool stuff