[HOTFIX] Cataclysm vmap-assembler issue w/WIN10. Crash creating .vmtree

[Frackalope]

Devs/All,

Today I attempted to run the dbc/vmaps/mmaps/maps extraction process and found that when vmap-assembler ran, it crashed when trying to build the first .vmtree file.  After looking at the code I found that this line in TileAssembler.cpp (120)

FILE* mapfile = fopen(mapfilename.str().c_str, "rwb");

was causing an issue since the file wasn't opened for write, but was trying to open for read which caused the app to crash.  I've replaced that line with:

FILE* mapfile = fopen(mapfilename.str().c_str, "w+b");

and recompiled since this will still allow the file to be created if it doesn't exist as well as open it for reading *after* the creation of the file.

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The vmaps directory already existed so that wasn't an issue.  Just wanted to let anyone know that is trying to run this and has the same issue.

[madmax]

I have passed this onto @antz