link_warning fix

[Bruno Haible]

Ulrich Drepper writes:

> > and comments (introduced by '#') are recognized by the assembler only after
> > #APP, not after #NO_APP. The workaround is to add '#APP' to the fake section
> > name. The following patch works for me.
> 
> If using #APP and #NO_APP makes a difference we'll have to add the
> #NO_APP as well.  Your patch so far doesn't do that.

#NO_APP tells the assembler that it doesn't need to watch out for
comment syntax and macros. Leaving the processing mode as #APP has no
negative effects, other than that the assembler will take a few more
microseconds to process very few libc internal files.

Bruno