This change...
1. replaces calls to timet2fattime/fattime2timet with calls to
timespec2fattime/fattime2timespec. I am assuming that the functions got
renamed before they landed in the kernel and the test code wasn't
updated.
2. adds a utc_offset stub.
With this, the test code builds and runs as a 32-bit binary (cc -Wall -O2
-m32 subr_fattime.c).