[Bug bootstrap/87741] Don't build readline/libreadline.a in GDB, when --with-system-readline is supplied

[dilyan.palauzov at aegee dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87741

--- Comment #6 from Дилян Палаузов <dilyan.palauzov at aegee dot org> ---
I have misspelled the domain — gnu.gcc.org