HEADS UP: new %m check for printf-alike functions

[Thomas Klausner <tk%giga.or.at@localhost>]

Hi!

There is a format string modifier "%m" (printing strerror(errno))
that's supported by syslog(), and some versions of *printf(), e.g. in
glibc.

Compiling on -current now warns when it finds this modifier in string
passed to a function that's not known to support this.

If you stumble over this, do something similar to:

printf("%m");

->

printf("%s", strerror(errno));

Just so you know.
 Thomas