private void setExternalEntryPoint(boolean external, Address address) {
		if (external) {
			currentProgram.getSymbolTable().addExternalEntryPoint(address);
		}
		else {
			currentProgram.getSymbolTable().removeExternalEntryPoint(address);
		}
	}
Set external entry point.  If declared external add as entry pointer, otherwise
clear as entry point if previously addeds.
@param external true if declared external and false otherwise
@param address address of the entry point
Ghidra/Features/Base/src/main/java/ghidra/app/util/bin/format/dwarf/DWARFFunctionImporter.java