Add generic Kbuild files for 'make headers_install'

This adds the Kbuild files listing the files which are to be installed by
the 'headers_install' make target, in generic directories.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
diff --git a/include/asm-generic/Kbuild.asm b/include/asm-generic/Kbuild.asm
new file mode 100644
index 0000000..d8d0bce
--- /dev/null
+++ b/include/asm-generic/Kbuild.asm
@@ -0,0 +1,11 @@
+unifdef-y += a.out.h auxvec.h byteorder.h errno.h fcntl.h ioctl.h	\
+	ioctls.h ipcbuf.h irq.h mman.h msgbuf.h param.h poll.h		\
+	posix_types.h ptrace.h resource.h sembuf.h shmbuf.h shmparam.h	\
+	sigcontext.h siginfo.h signal.h socket.h sockios.h stat.h	\
+	statfs.h termbits.h termios.h timex.h types.h unistd.h user.h
+
+# These really shouldn't be exported
+unifdef-y += atomic.h io.h
+
+# These probably shouldn't be exported
+unifdef-y += elf.h page.h