@Override
		public boolean accept(File file) {
			for (String excludedExtension : excludedFileExtensions) {
				if (file.getName().endsWith(excludedExtension)) {
					return false;
				}
			}
			return true;
		}
Puts a directory in the jar for Ghidra Extensions. This may be empty (if
no extensions are installed) but should exist nonetheless.

@throws IOException if there's an error writing to the jar
Ghidra/Features/Base/src/main/java/ghidra/util/GhidraJarBuilder.java