Merge changes Id513b72a,I92cd0116,I62393b58,I90ac2224,I527f88ac

* changes:
  Provide fake definitions for libstdc++.
  Provide static inlines for in6addr things.
  Provide an inline __cmsg_nxthdr.
  Correct more fortify availability guards.
  Move strncpy fortify into android-21.
diff --git a/libc/arch-arm/bionic/__bionic_clone.S b/libc/arch-arm/bionic/__bionic_clone.S
index a85ea34..8836748 100644
--- a/libc/arch-arm/bionic/__bionic_clone.S
+++ b/libc/arch-arm/bionic/__bionic_clone.S
@@ -51,7 +51,7 @@
 
     # Are we the child?
     movs    r0, r0
-    beq     1f
+    beq     .L_bc_child
 
     # In the parent, reload saved registers then either return or set errno.
     ldmfd   sp!, {r4, r5, r6, r7}
@@ -60,9 +60,9 @@
     neg     r0, r0
     b       __set_errno_internal
 
-    # The child.
-    # Setting lr to 0 will make the unwinder stop at __start_thread
-1:  mov    lr, #0
+.L_bc_child:
+    # Setting lr to 0 will make the unwinder stop at __start_thread.
+    mov    lr, #0
     # Call __start_thread with the 'fn' and 'arg' we stored on the child stack.
     pop    {r0, r1}
     b      __start_thread