[Ada] Remove Determine_License

[Pierre-Marie de Rodat]

The routine Determine_License is brittle and doesn't e.g. handle
properly wide characters. Furthermore this is just a heuristic, which
isn't really needed, so remove it to simplify maintenance and remove
latent issues with wide characters.

Tested on x86_64-pc-linux-gnu, committed on trunk

2020-06-10  Arnaud Charlet  <charlet@adacore.com>

gcc/ada/

	* scn.adb (Determine_License): Remove.
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