Updating INSTALL file

[Ash Kamel]

Hello everyone and fellow divers,

I just wanted to let you all know about a small tweak that could help
people new to building from source.  Take a look at this PR
https://github.com/torvalds/subsurface/pull/120 . It hopfully makes it
clear which directory the executable will be in after running the build.sh
script.

Regards,

Ash Kamel
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