gcc14 compatibility in Einstein Toolkit thorns

[Roland Haas]

GCC14 remove implicit pointer casts and requires explicit casts for C in the same manner that C++ requires them.

https://gcc.gnu.org/gcc-14/porting_to.html

This ticket collects pull requests with fixes to Einstein Toolkit thorns that address this

[Roland Haas]

Pull request for CactusNumerical thorns (symmetry thorns, mostly) is here:
https://bitbucket.org/cactuscode/cactusnumerical/pull-requests/23

[Roland Haas]

Pull request for TwoPunctures is here:

https://bitbucket.org/einsteintoolkit/einsteininitialdata/pull-requests/18

[Roland Haas]

Please review.

[Roland Haas]

@Steven R Brandt says “please apply”

[Roland Haas]

Applied as git hash 5144bf41 "RotatingSymmetry90: explicitly cast const pointer arguments" of cactusnumerical

Applied as git hash 32a4a3d2 "TwoPunctures: explicitly cast for restrict and const qualifiers" of einsteininitialdata