Abbreviation of "microsecond" in sane.ds

[Alex Henrie]

http://source.winehq.org/git/wine.git/blob/c72f9a0082c3cc07454fb93bca88e2940afc5dcf:/dlls/sane.ds/sane.rc#l35

Is there a compelling reason why "microsecond" is abbreviated as "us"
instead of "μs"? This library doesn't correspond to any Windows
library, so we should be free to use the more correct abbreviation. Or
can sane.rc only accept ASCII characters?

-Alex