[mkgmap-dev] Commit r4887: Fix assertions to actually check the calculated sizes.

Version mkgmap-r4887 was committed by gerd on Tue, 01 Feb 2022 Fix assertions to actually check the calculated sizes. The code to read TRE7 data (extended types offsets) only works for maps where tre7.recsize() <= 13. Maps can have larger record sizes and the current logic in TreFileReader.readExtTypeOffsetsRecords() fails with them. No problem for mkgmaps own maps but RgnDisplay may show nonsense with those maps http://www.mkgmap.org.uk/websvn/revision.php?repname=mkgmap&rev=4887