Remove a useless shebang from DBD::mysql

[ppisar]

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Shebang has only a meaning for an executable script. DBD::mysql Perl module is not an executable script that someone would run as an standalone program. Morover, the file would have to have set an executable bit. It seems the erroneous shebang was added by a mistake when removing an Emacs configuration line.

This patch removes the shebang.