[9fans] vga vesa works on mp pc

[geoff]

I've just pushed out a small change to /sys/src/9/pc/realmode.c that
allows monitor=vesa to work on multiprocessor pcs without *nomp being
defined in plan9.ini (i.e., you can use all available processors [or
cores] and still use vesa mode).  I've also pushed out new kernels, so
the distribution built tonight should include this fix.