Do not use static buffer in printd

Do not use static buffer in printd

200 bytes of buffer space is not enough.

And glibc 2.0 as well as Microsoft's crt will return -1 for overly
large strings and all hell breaks loose then.

Code is taken almost verbatim from this system's printf(3) man page
which has following to say:

COLOPHON
       This  page  is  part of release 3.23 of the Linux man-pages project.  A
       description of the project, and information about reporting  bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.