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truss: add fake __NSEC syscall name for ape

--- a/sys/lib/acid/truss

+++ b/sys/lib/acid/truss

@@ -153,15 +153,13 @@

 		"_PREAD",

 		"_PWRITE",

 		"_TSEMACQUIRE",

+		"__NSEC",

 	};

 defn addressof(pattern) {

 	// translate to ape system calls if we have an ape binary

-	if _addressof("_EXITS") != 0 then {

+	if _addressof("_EXITS") != 0 then

 		pattern = trussapecalls[match(pattern, trusscalls)];

-		if pattern == {} then

-			return 0;

-	}

 	if regexp("(seek|_SEEK)", pattern) && (objtype=="amd64" || objtype == "power64" || objtype == "alpha") then

 		pattern = "_" + pattern;

 	return _addressof(pattern);