skip 64bit rngs on 32bit

[rurban]

long unsigned int results and max cannot be represented with the gsl dictated (wrong) types for get and max. UINT64_MAX will be truncated to 32bit, as well as the rng results.

we could easily fix that by defining those types as uint64_t, but these types come from libgsl.

we could skip them, or rewrite them to return only 32bit results.

[rurban]

I decided to skip some objects at all:

• rng_efiix64.c
• rng_romu.c
• rng_speck128.c
• rng_xoroshiro64bit.c
• rng_mt64.c

plus the 64bit variants for pcg64, threefry, philox, mt64, jsf64

and workaround the rest, to return 32bit only.:

• lxm
• rdrand
• wyrand

[rurban]

Done with 4d058eae1128e5759763259a5a0dd9d2c2d2dc3d