nsdispatch.c: New file added along with required dependencies

This file uses dynamic loading and is using some magic for
statically linked modules included in it. These modules may
or may not show up magically in an RTEMS executable. This will
eventually have to be investigated and resolved.

freebsd-userspace/lib/libc/net/nsparser.h

@@ -0,0 +1,14 @@
+#define NL 257
+#define SUCCESS 258
+#define UNAVAIL 259
+#define NOTFOUND 260
+#define TRYAGAIN 261
+#define RETURN 262
+#define CONTINUE 263
+#define ERRORTOKEN 264
+#define STRING 265
+typedef union {
+	char *str;
+	int   mapval;
+} YYSTYPE;
+extern YYSTYPE _nsyylval;