Bump soversion due to move to C11 standard

Markus Blattrequested to merge
blattms/alberta3:fix/bump-so-version into main

In version 3.1.0 there was a change to use the C11 standard, which is ABI-incompatible to previous ones

Incompabtibilities:

get_quad_fast ( BAS_FCTS const* bas_fcts, QUAD const* quad, FLAGS init_flag )  1

The parameter init_flag became passed in r13 register instead of r14.

We play it save here and bump the soversion.

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