[TYPO3-core] RFC: Treat symlinks as executable

[Michael Stucki]

This is a SVN patch request.

Problem:
There are various places where programs are checked for being executable.
However, this does not work if the program is just a symlink.

This is usually needed in larger hosting environments when
safe_mode_exec_dir is used and allowed programs are placed in a special
directory. Currently they would all need to be copied, hence they won't be
upgraded automatically by the systems package manager.

Solution:
If is_executable() is false, check using is_link() and accept this as well.

Branches: TYPO3_4-0 and Trunk

- michael
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