Bug#825084: Package links against libmysqlclient_r

[Lars Tangvald]

Hi,

There isn't really a way to verify the thread safety aside from what's 
in the test suite, but how old systems do you consider when you say «old 
boxes»? Ones with eol'ed versions of MySQL (< 5.5)?
In 5.5 and 5.6 there's no difference between libmysqlclient and 
libmysqlclient_r, as the latter was only included for backwards 
compatibility.
I can do some digging to find out exactly when _r was made a symlink.

--
Lars