Import bochs-2.6.7 as wip/bochs.

The program bochs is a highly portable open source x86 PC emulator
written in C++, and runs on most popular platforms.  It includes
emulation of the Intel x86 CPU, common IO devices, and a custom
BIOS.  Currently, bochs can be compiled to emulate a 386, 486,
Pentium, Pentium PRO or AMD64 CPU.

Bochs is capable of running most operating systems inside the
emulation including Linux, NetBSD, Windows 95, DOS, and Windows NT 4.
When updated to 3.7.5.1, PLIST of gnuradio-dtv should also have been updated.