Fix -DNEDUG builds

- assert() is macro which is defined as empty, while panic is always
   present. I added an explicit abort() after the macro to make sure the
   function never returns in case of wrong flags.

 - Fixed gcc build with -NDEBUG, -Os for ARM.
   * A few 'may be used uninitialized' messages
   * A few new missing support library functions where added in libminc.

Change-Id: I69fcda2cd3888390b7ddeff4c0cd849105ce86ff

external/bsd/flex/dist/scanopt.c

@@ -715,6 +715,11 @@ int     scanopt (svoid, arg, optindex)
 	struct _aux *auxp;
 	int     is_short;
 	int     opt_offset = -1;
+#if defined(__minix)
+	/* triggers a 'may be used uninitialized', when compiled with gcc,
+	 * asserts off, and -Os. */
+	is_short = 0;
+#endif /* defined(__minix) */
 
 	s = (struct _scanopt_t *) svoid;