[Bug driver/70783] -spec option behavior is different to implicit spec file

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70783

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
This might be a slight documentation error.
Originally GCC would put a copy of the full specs (created via -dumpspecs
option) under $libpath/gcc/$target/$version/specs.  And the user could edit
that adding their own and that file would override fully the builtin specs. 
-specs would amend to the specs rather than replace.