Fix sed error for Linux sed version.

[stefanproell]

Adds a switch for Linux and MacOS sed -i -e versions.

[mysql-oca-bot]

Hi, thank you for submitting this pull request. In order to consider your code we need you to sign the Oracle Contribution Agreement (OCA). Please review the details and follow the instructions at http://www.oracle.com/technetwork/community/oca-486395.html
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[mysql-oca-bot]

Hi, there was no response to our request to sign an OCA or confirm the code is submitted under the terms of the OCA. As such this request will be closed.
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[mysql-admin]

Reopening to allow for additional response time
==Omer

[mysql-oca-bot]

Hi, thank you for your contribution. Please confirm this code is submitted under the terms of the OCA (Oracle's Contribution Agreement) you have previously signed by cutting and pasting the following text as a comment:
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[stefanproell]

I confirm the code being submitted is offered under the terms of the OCA, and that I am authorized to contribute it.

[mysql-oca-bot]

Hi, thank you for your contribution. Your code has been assigned to an internal queue. Please follow
bug http://bugs.mysql.com/bug.php?id=102936 for updates.
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[marcalff]

[copy of comments added in bug#102936]

Thanks for the contribution.

The toolchain used to generate C code from SQL has been reimplemented in MySQL 8.0,
so that the build process no longer use a script with a sed.

The fix was correct, but is no longer applicable as the underlying code changed.

Closing as can't repeat in 8.0.