fix signal.h breakage from moving stack_t to arch-specific bits

in the previous changes, I missed the fact that both the prototype of
the sigaltstack function and the definition of ucontext_t depend on
stack_t.

1 files changed, 2 insertions, 0 deletions

diff --git a/include/signal.h b/include/signal.h
index ab21e5c0..3fb21b2a 100644
--- a/include/signal.h
+++ b/include/signal.h
@@ -77,6 +77,8 @@ extern "C" {
 #define CLD_STOPPED 5
 #define CLD_CONTINUED 6
 
+typedef struct sigaltstack stack_t;
+
 union sigval {
 	int sival_int;
 	void *sival_ptr;