Remove silly LimitedPrecisionConstant class

[rwst]

brun fails horribly:

sage: brun.n()
NotImplementedError: brun is only available up to 41 bits
sage: brun?
NotImplementedError: brun is only available up to 41 bits
sage: brun??
NotImplementedError: brun is only available up to 41 bits

and this leads to sporadic failure of random_expr, falsifying patchbot test results.

CC: @kcrisman

Component: symbolics

Author: Ralf Stephan

Branch/Commit: 3e8d598

Reviewer: Karl-Dieter Crisman, Jeroen Demeyer

Issue created by migration from https://trac.sagemath.org/ticket/18255

[rwst]

Branch: u/rws/remove_silly_limitedprecisionconstant_class

[rwst]

Commit: 522c48b

[rwst]

Author: Ralf Stephan

[rwst]

New commits:

522c48b

18255: Remove silly LimitedPrecisionConstant class

[rwst]

comment:5

It makes patchbot runs useless. Certainly not minor.