[Toybox] 81207825c50fa9a4ec1475024543f830dee247fd broke bionic build

[enh]

this hunk from 81207825c50fa9a4ec1475024543f830dee247fd:

diff --git a/toys.h b/toys.h
index 4083725a..df37b55e 100644
--- a/toys.h
+++ b/toys.h
@@ -108,7 +108,7 @@ extern struct toy_context {
   char wasroot;            // dropped setuid

   // This is at the end so toy_init() doesn't zero it.
-  jmp_buf *rebound;        // longjmp here instead of exit when do_rebound set
+  sigjmp_buf *rebound;     // longjmp here instead of exit when do_rebound set
   struct arg_list *xexit;  // atexit() functions for xexit(), set by sigatexit(
)
   void *stacktop;          // nested toy_exec() call count, or 0 if vforked
 } toys;

caused:

external/toybox/toys/net/netcat.c:188:37: error: incompatible pointer
types assigning to 'sigjmp_buf *' (aka 'long (*)[33]') from 'jmp_buf
*' (aka 'long (*)[32]') [-Werror,-Wincompatible-pointer-types]
          if (toys.optflags&FLAG_L) NOEXIT(child = XVFORK());
                                    ^~~~~~~~~~~~~~~~~~~~~~~~
external/toybox/lib/lib.h:375:19: note: expanded from macro 'NOEXIT'
#define NOEXIT(x) WOULD_EXIT(_noexit_res, x)
                  ^~~~~~~~~~~~~~~~~~~~~~~~~~
external/toybox/lib/lib.h:367:16: note: expanded from macro 'WOULD_EXIT'
  toys.rebound = &_noexit; \
               ^ ~~~~~~~~
1 error generated.

hmm... looks like you always call setjmp (rather than sigsetjmp) but
also always call siglongjmp?

so the real fix is probably to s/setjmp/sigsetjmp/ and move _noexit
over to sigjmp_buf too:

#define WOULD_EXIT(y, x) do { jmp_buf _noexit; \

patch attached...
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