win terminal: rotation of axes labels

[Bastian M. <bma...@we...>]

Hello,

It seems there's another bug in the windows terminal: under certain 
circumstances axes labels may no longer be rotated.

Here's an example script, which produces the expected output with post 
and png terminals (others not tested):

   set termoption enhanced
   set format y "%.1t 10^{%T}"
   set ylabel "label 1" rotate by 90
   set y2label "label 2" rotate by -90
   plot x

Sample output for win and png terminals are attached. The "set format" 
line seems to break the behaviour on windows. Labels are always drawn 
horizontally, no matter if I specify a rotation or not.
I have tested this on 4.4rc1.

Bastian