Make ListedSpdxLicense static
Make ListedSpdxLicense static

This is a FindBugs reported performance issue.

yevster/tools,yevster/tools,rtgdk/tools,sschuberth/spdx-tools,rtgdk/tools,yevster/tools,yevster/tools,rtgdk/tools,sschuberth/spdx-tools,sschuberth/spdx-tools,yevster/tools,sschuberth/spdx-tools,sschuberth/spdx-tools