public void removeExternalEntryPoint(Address addr) {
		if (isExternalEntryPoint(addr)) {
			removeReference(Address.EXT_FROM_ADDRESS, addr, CodeUnit.MNEMONIC);
			externalEntryPointRemoved(addr);
		}
	}
Removes the external entry point at the given address
@param addr that address at which to remove the external entry point attribute.
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/references/ReferenceDBManager.java