[v1.9.x] Remove the "copyright by contributors" line in source files

[TristonC]

Description

This PR is the action item 5, for the issue 20475. It removes the "Copyright by Contributors" line in the ./src, ./include, ./tools and 3rdparty/mshadow directories and their sub-directories.

Checklist

Essentials

• PR's title starts with a category (e.g. [BUGFIX], [MODEL], [TUTORIAL], [FEATURE], [DOC], etc)
• Changes are complete (i.e. I finished coding on this PR)
• All changes have test coverage
• Code is well-documented

Changes

• Remove the "Copyright by Contributors" line in the ./src direcotry and its sub-directories.
• Remove the "Copyright by Contributors" line in the ./include direcotry and its sub-directories.
• Remove the "Copyright by Contributors" line in the ./tools direcotry and its sub-directories.
• Remove the "Copyright by Contributors" line in the ./3rdparty/mshadow direcotry and its sub-directories.

Comments

[mxnet-bot]

Hey @TristonC , Thanks for submitting the PR
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