Fixes ticket:297. Refactors how usrp2/firmware is built. NowAC_CONFIG_SUBDIRS is always called, and there's a AM_CONDITIONAL inusrp2/firmware that decides whether anything really gets built or not.
I think this will fix the "double cross" issue (cross-compiling the...
Merged r9433:9527 from features/gr-usrp2 into trunk. Adds usrp2 and gr-usrp2 top-level components. Trunk passes distcheck with mb-gcc installed, but currently not without them. The key issue is that when mb-gcc is not installed, the build system skips over the usrp2/firmware directory, and the firmware include files don't get put into the dist tarball. But we can't do the usual DIST_SUBDIRS method as the firmware is a subpackage....