[Midnightbsd-cvs] src: tsc.c: Fix build error with missing header on amd64.

[laffer1 at midnightbsd.org]

Log Message:
-----------
Fix build error with missing header on amd64.

Modified Files:
--------------
    src/sys/amd64/amd64:
        tsc.c (r1.3 -> r1.4)
        (http://cvsweb.midnightbsd.org/src/sys/amd64/amd64/tsc.c?r1=1.3&r2=1.4)