Add missing Signal related consts

(backport <rust-lang#4352>)
(cherry picked from commit c3dab47)

Author: hax0kartik

src/vxworks/mod.rs

@@ -967,11 +967,34 @@ pub const SIGCONT: c_int = 19;
 pub const SIGCHLD: c_int = 20;
 pub const SIGTTIN: c_int = 21;
 pub const SIGTTOU: c_int = 22;
+pub const SIGUSR1: c_int = 30;
+pub const SIGUSR2: c_int = 31;
+pub const SIGPOLL: c_int = 32;
+pub const SIGPROF: c_int = 33;
+pub const SIGSYS: c_int = 34;
+pub const SIGURG: c_int = 35;
+pub const SIGVTALRM: c_int = 36;
+pub const SIGXCPU: c_int = 37;
+pub const SIGXFSZ: c_int = 38;
+pub const SIGRTMIN: c_int = 48;
+
+pub const SIGIO: c_int = SIGRTMIN;
+pub const SIGWINCH: c_int = SIGRTMIN + 5;
+pub const SIGLOST: c_int = SIGRTMIN + 6;
 
 pub const SIG_BLOCK: c_int = 1;
 pub const SIG_UNBLOCK: c_int = 2;
 pub const SIG_SETMASK: c_int = 3;
 
+pub const SA_NOCLDSTOP: c_int = 0x0001;
+pub const SA_SIGINFO: c_int = 0x0002;
+pub const SA_ONSTACK: c_int = 0x0004;
+pub const SA_INTERRUPT: c_int = 0x0008;
+pub const SA_RESETHAND: c_int = 0x0010;
+pub const SA_RESTART: c_int = 0x0020;
+pub const SA_NODEFER: c_int = 0x0040;
+pub const SA_NOCLDWAIT: c_int = 0x0080;
+
 pub const SI_SYNC: c_int = 0;
 pub const SI_USER: c_int = -1;
 pub const SI_QUEUE: c_int = -2;