[Bug-readline] Blinking of matching parenthesis is not enabled by default

[Mark Karpov]

Found in Readline 6.3-release. ASUS K52D laptop, Arch Linux x86_64,
Linux 3.17.6-1 kernel.

Description:

After initialization of Readline functions like rl_variable_value or
rl_variable_dumper report that variable "blink-matching-paren" is bound
to "on". It's not so. Matching parenthesis don't blink. However, if you
do:

rl_initialize ();
rl_variable_value ("blink-matching-paren"); // => "on"
rl_variable_bind ("blink-matching-paren", "on"); // explicitly rebinding
// the variable
readline (NULL); // now it's really "on"

they will blink.

Either make Readline report value of "blink-matching-paren" as "off"
after initialization or make parenthesis blink without explicit
rebinding.