ci: fix bootstrapping on macos/freebsd etc

vlib/os/debugger_darwin.c.v

@@ -0,0 +1,16 @@
+module os
+
+#include <sys/ptrace.h>
+
+fn C.ptrace(int, u32, voidptr, int) int
+
+// debugger_present returns a bool indicating if the process is being debugged
+[inline]
+pub fn debugger_present() bool {
+	// check if the parent could trace its process,
+	// if not a debugger must be present
+	$if macos {
+		return C.ptrace(C.PT_TRACE_ME, 0, voidptr(1), 0) == -1
+	}
+	return false
+}