bsd-user/x86_64/target_arch_signal.h: use new target_os_ucontext.h

Signed-off-by: Warner Losh <imp@bsdimp.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

bsd-user/x86_64/target_arch_signal.h

@@ -30,14 +30,7 @@
 typedef struct target_mcontext {
 } target_mcontext_t;
 
-typedef struct target_ucontext {
-    target_sigset_t   uc_sigmask;
-    target_mcontext_t uc_mcontext;
-    abi_ulong         uc_link;
-    target_stack_t    uc_stack;
-    int32_t           uc_flags;
-    int32_t         __spare__[4];
-} target_ucontext_t;
+#include "target_os_ucontext.h"
 
 struct target_sigframe {
     abi_ulong   sf_signum;