restore dos2unix conversion for patched files

Submitted by:	rodrigo (maintainer)
- Fix stage-qa when USES contains desktop-file-utils twice

Reported by:	mandree
With hat:	portmgr
- Fix when USES not defined

With hat:	pormtmgr
Pointyhat to:	bdrewery
Update to the 20140423 snapshot of GCC 4.9.1.  This is basically the
GCC 4.9.0 release, but since we did not yet use the new way of labeling
snapshots as part of PORTVERSION we could not update to that directly
without using PORTEPOCH.  Going forward that will be possible.

Adjust DISTVERSION and GCC_VERSION to the new PORTVERSION scheme.
- Fix regression from r315599: Allow pkg to install itself first
  if not yet installed and WITH_PKGNG is set. Just skip the
  vulnerabilities check as intended in r315599.

With hat:	portmgr
Reported by:	diizzy on EFNet
Pointyhat to:	bdrewery (with interest)
Fix minor plist issues from check-plist
- Update to "6.6.1" [1]
- Switch to using @sample keyword, fixing orphans.

Upstream note on "6.6.1" [1]:

  OpenSSH 6.5 and 6.6 sometimes encode a value used in the curve25519
  key exchange incorrectly, causing connection failures about 0.2% of
  the time when this method is used against a peer that implements
  the method properly.

  Fix the problem and disable the curve25519 KEX when speaking to
  OpenSSH 6.5 or 6.6. This version will identify itself as 6.6.1
  to enable the compatability code.

[1] https://lists.mindrot.org/pipermail/openssh-unix-dev/2014-April/032494.html
Finely tune KRB5_HOME test when using LIB_DEPENDS. in the case when
KRB5_HOME is set to LOCALBASE.