Add FreeBSD required defines to mntent.h

[mattmacy]

Signed-off-by: Matt Macy [email protected]

Motivation and Context

Description

How Has This Been Tested?

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Performance enhancement (non-breaking change which improves efficiency)
• Code cleanup (non-breaking change which makes code smaller or more readable)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation (a change to man pages or other documentation)

Checklist:

• My code follows the ZFS on Linux code style requirements.
• I have updated the documentation accordingly.
• I have read the contributing document.
• I have added tests to cover my changes.
• All new and existing tests passed.
• All commit messages are properly formatted and contain Signed-off-by.

[codecov]

Codecov Report

Merging #9632 into master will decrease coverage by 0.17%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #9632      +/-   ##
==========================================
- Coverage   79.23%   79.06%   -0.18%     
==========================================
  Files         418      418              
  Lines      123544   123531      -13     
==========================================
- Hits        97889    97668     -221     
- Misses      25655    25863     +208

Flag	Coverage Δ
#kernel	79.88% <ø> (-0.05%)	⬇️
#user	66.38% <ø> (-0.34%)	⬇️

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