Add mssing link dependency and fix checksum

[wmtan]

If feasible, do not merge this pull request info CMSSW_7_4_ROOT6_X, as this needs to be fixed separately there.
In ROOT 5.34, and ROOT 6, checksums depend on the base class.
Because of a missing link dependency, DataFormats/ParticleFlowReco was built before DataFormats/TrajectorySeed.
Because of this, edmCheckClassVersion calculated the wrong checksum. The problem with edmClassVersion needs to be fixed separately, because the checksum it calculates can depend on build order of the packages.
This pull request supplies the missing dependency, and updates the checksum accordingly.
Please expedite this critical pull request, bypassing signatures if not signed in a timely manner.
However, do not bypass testing, comparisons, and all that!!

[cmsbuild]

A new Pull Request was created by @wmtan for CMSSW_7_4_X.

Add mssing link dependency and fix checksum

It involves the following packages:

DataFormats/ParticleFlowReco

@cmsbuild, @cvuosalo, @nclopezo, @slava77 can you please review it and eventually sign? Thanks.
@bachtis, @lgray this is something you requested to watch as well.
You can sign-off by replying to this message having '+1' in the first line of your reply.
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[slava77]

@cmsbuild please test

[cmsbuild]

The tests are being triggered in jenkins.

[cmsbuild]

+1
Tested at: 24fe51e
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-7291/2012/summary.html

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-7291/2012/summary.html

[slava77]

+1

for #7291 24fe51e

jenkins is ok: runs, no diffs

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_7_4_X IBs unless changes (tests are also fine). This pull request will be automatically merged.