move rtpSpawn from libstd to libc

Author: bpangWR

src/vxworks/mod.rs

@@ -2050,6 +2050,15 @@ extern "C" {
 
     // rtpLibCommon.h
     pub fn rtpInfoGet(rtpId: ::RTP_ID, rtpStruct: *mut ::RTP_DESC) -> ::c_int;
+    pub fn rtpSpawn(
+        pubrtpFileName: *const ::c_char,
+        argv: *const *const ::c_char,
+        envp: *const *const ::c_char,
+        priority: ::c_int,
+        uStackSize: ::size_t,
+        options: ::c_int,
+        taskOptions: ::c_int,
+    ) -> RTP_ID;
 
     // ioLib.h
     pub fn _realpath(