bugfix: attribute NORMAL decoding error in gcc and clang compiler

[HuazyYang]

bugfix: Attribute NORMAL decoding error in gcc and clang compiler: std c lib function int abs(int) can implicitly convert float toint and return an integer, which is not expected as to MSVC compiler.

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[HuazyYang]

@googlebot I signed it!

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[HuazyYang]

@googlebot I fixed it.

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[HuazyYang]

@googlebot I fixed it.

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[HuazyYang]

@googlebot I fixed it.

[google-cla]

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[HuazyYang]

@googlebot I signed it!

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[HuazyYang]

@googlebot I fixed it.

[google-cla]

We found a Contributor License Agreement for you (the sender of this pull request), but were unable to find agreements for all the commit author(s) or Co-authors. If you authored these, maybe you used a different email address in the git commits than was used to sign the CLA (login here to double check)? If these were authored by someone else, then they will need to sign a CLA as well, and confirm that they're okay with these being contributed to Google.
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[HuazyYang]

We found a Contributor License Agreement for you (the sender of this pull request), but were unable to find agreements for all the commit author(s) or Co-authors. If you authored these, maybe you used a different email address in the git commits than was used to sign the CLA (login here to double check)? If these were authored by someone else, then they will need to sign a CLA as well, and confirm that they're okay with these being contributed to Google. In order to pass this check, please resolve this problem and then comment @googlebot I fixed it.. If the bot doesn't comment, it means it doesn't think anything has changed.

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Why your auto-robot still complain CLA problem after I agree with it thousand times.

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[HuazyYang]

@googlebot I fixed it.

[google-cla]

We found a Contributor License Agreement for you (the sender of this pull request), but were unable to find agreements for all the commit author(s) or Co-authors. If you authored these, maybe you used a different email address in the git commits than was used to sign the CLA (login here to double check)? If these were authored by someone else, then they will need to sign a CLA as well, and confirm that they're okay with these being contributed to Google.
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[HuazyYang]

@googlebot I fixed it.

[HuazyYang]

chang abs to std::abs here.

[tomfinegan]

This has been fixed upstream and will be included in the next release. You can close this PR.

[HuazyYang]

I have no authority to close this PR, Any help will be appreciated.