BundleUtilities: do not run install_name_tool on scripts

T.J. Coronarequested to merge
tjcorona/cmake:fixup_bundle_item-fix into master

Copying the logic of commit 08be74bf from !2748 (merged), check if a file is a bash script before running install_name_tool on it. Otherwise, the call errors out with file is not a Mach-O file.

Edited by Brad King

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