[TYPO3-core] RFC: #10660: "Click to remove the file now!" to remove ENABLE_INSTALL_TOOL only when file is writeable

[Steffen Gebert]

Hi list,

This is an SVN patch request.

Type: Bug

Bugtracker reference:
http://bugs.typo3.org/view.php?id=10660

Branches: 4.2, trunk

Problem:
#5788 introduced a nice link to remove the ENABLE_INSTALL_TOOL file directly 
in the nag-box in About Modules.
Unfortunately the link "Click to remove the file now!" is also displayed, if 
the webserver user has no rights to delete the file at all.

Solution:
Add check is_writable()

Thanks for your review!
Steffen
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