can one apply BUILDLINK_TRANSFORM to individual source files?

[David Holland <dholland-pkgtech%netbsd.org@localhost>]

Is there a way to apply BUILDLINK_TRANSFORM to a single specific
source file in a package?

The latest seamonkey will not build with gcc 4.1 (see PR
toolchain/46442) and BUILDLINK_TRANSFORM+= rm:-O2 is a workaround, but
building the whole browser without optimization is not, let's say,
entirely desirable.

(Alternatively, disabling SSE2 might be a suitable workaround, but I
don't know how to do that properly and I don't want to make a mess.)

-- 
David A. Holland
dholland%netbsd.org@localhost