Remove dynamic exception specifications

[SoapGentoo]

Fixes #37

[SoapGentoo]

@wojdyr we're starting to see failures downstream with GCC 11

[wojdyr]

Sorry for late reply.

Exception specification is there only for SWIG. If nothing changed, SWIG generates code that catches specified exceptions.

I'm afraid fityk is still C++03, but it probably compiles with C++11/14. My plan was (and still is) to make the last release in C++03 and then modernize the code, but in recent years fityk got rather neglected and I haven't made a release for a long time.