Oops, fix the fix in rev.1.10.  logb() and logbf() were broken on denormals, and logb() remained broken after 1.10 because the fix for logbf() was incompletely translated.
Oops, fix the fix in rev.1.10.  logb() and logbf() were broken on
denormals, and logb() remained broken after 1.10 because the fix for
logbf() was incompletely translated.

Convert to __FBSDID().

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase