public int getExternalBlockReserveSize() {
		return 0x10000; // 64K
	}
Get reserve size of the EXTERNAL memory block as addressable units
within the default memory space.  This size represents the largest 
expansion size to the block which could occur during relocation
processing.
@return reserve size of the EXTERNAL memory block as addressable units
Ghidra/Features/Base/src/main/java/ghidra/app/util/bin/format/elf/extend/ElfLoadAdapter.java