MFC r228099,r245171,r277939:

MFC r228099,r245171,r277939:

r228099:

  - Create links to the xz and lzma versions even if BSD grep is not the
    default. Nor GNU nor liblzma in base provides such functionality so
    it may be useful.

r245171:

  Following r226271, allow disabling lzma support with "WITHOUT_LZMA_SUPPORT".
  Correct r226271 which should have used WITHOUT_BZIP2_SUPPORT per r166255.

  Obtained from:	Juniper Networks

r277939:

  Create MANLINKS for lzgrep, etc when MK_LZMA_SUPPORT != no

  Sponsored by: EMC / Isilon Storage Division

git-svn-id: svn://svn.freebsd.org/base/stable/9@278062 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f