tools/wixl: Support use of FileKey in CustomAction
requested to merge LiamHaworth/msitools:feature/support-use-of-file-key-for-custom-action into master
Working on project that builds a 32bit installer intended to be installed on both 32bit and 64bit systems, to support this the CustomActions in the installer need to be aware of the installed location.
MSI's support this through the use of FileKey which informs the MSI to
use the file installed on the system referenced by FileKey.
This pull request updates the fields of WixCustomAction to include the
field FileKey and updated the logic of visit_custom_action (in builder.vala)
to check for the validity of the field.
If the field has been set the custom action will be of the type EXE_FILE,
otherwise the existing behaviour of using EXE_PROPERTY remains.