Parent of prefix dir not writable

[Neal Murphy]

Howdy!

A small oddity. I configured ctng to not remove the prefix dir. But the tool 
errors out when the parent is not writable. I think this test:

# Check now if we can write to the destination directory:
if [ -d "${CT_INSTALL_DIR}" ]; then
    CT_TestAndAbort "Destination directory '${CT_INSTALL_DIR}' is not 
removable" ! -w $(dirname "${CT_INSTALL_DIR}")
fi

should also test CT_RM_RF_PREFIX_DIR and do nothing if the var is 'not set'. 
Worded differently, if I don't want the prefix dir removed, then it shouldn't 
matter if the parent dir is not writable.

Neal

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