tile: switch to generic clone()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/arch/tile/include/asm/unistd.h b/arch/tile/include/asm/unistd.h
index dab827d..b51c6ee 100644
--- a/arch/tile/include/asm/unistd.h
+++ b/arch/tile/include/asm/unistd.h
@@ -17,4 +17,5 @@
 #endif
 #define __ARCH_WANT_SYS_NEWFSTATAT
 #define __ARCH_WANT_SYS_EXECVE
+#define __ARCH_WANT_SYS_CLONE
 #include <uapi/asm/unistd.h>