gap-system / gap / 11837

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kernel: add some 'missing' methods for machine floats

- A bunch of operations for floating point numbers had no implementation for
  machine floats, even though C99 provides suitable functions.

- Most of the math functions we checked for in configure are actually
  guaranteed to be there by C99. The sole exception is exp10, which is a
  non-standard extension.

- Add a bunch of super-trivial tests to ensure those new functions are
  actually callable. These are not good tests, just a bare minimum.

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