n FreeBSD 8 the name of the mtime member of struct stat was st_mtimespec.
In the early days of FreeBSD 9 (after the branch but before 9.0-RELEASE),
it was renamed to st_mtim in src rev r205792 for POSIX 2008 compliance.
This change was never merged back to 8-STABLE. There was no corresponding
bump of __FreeBSD_version, but the change happened between r900010 and
r900011. Patch the source to use the old name when building on FreeBSD 8.
Remove the BROKEN tag to allow the port to be built on FreeBSD 8.
Differential Revision: https://reviews.freebsd.org/D2281
Reviewed by: kwm
Approved by: mat (mentor)