Tools: unnecessary to make qmlplugindump a bundle

Embed Info.plist in qmlplugindump executable in a special way.

Change-Id: Ia83cf15a1dc8c7e37560a280bd711ff2e4468ad8
(cherry-picked from qtdeclarative/4d173d5f16c103f640d4089feed44a74b14e9004)
Reviewed-by: Liang Qi <liang.qi@digia.com>