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/configure.in b/configure.in
index 8867f07..ffb1009 100644
--- a/configure.in
+++ b/configure.in
@@ -397,6 +397,7 @@
    coregrind/demangle/Makefile 
    coregrind/docs/Makefile
    coregrind/x86/Makefile
+   coregrind/x86-linux/Makefile
    addrcheck/Makefile
    addrcheck/tests/Makefile
    addrcheck/docs/Makefile