Enable the use of `__uint128_t` or `uint64_t` if available #74

Job	Run time
Windows VS2019 auto-bit wide limbs C++20	3m 59s
Windows VS2019 32-bit wide limb C++20	3m 8s
Windows VS2019 16-bit wide limbs C++20	3m 7s
Windows VS2022 auto-bit wide limbs C++20	3m 9s
Windows VS2022 32-bit wide limb C++20	3m 9s
Windows VS2022 16-bit wide limbs C++20	4m 10s
Windows Clang auto-bit wide limbs C++20	2m 45s
Windows Clang 32-bit wide limb C++20	2m 46s
Windows Clang 16-bit wide limbs C++20	2m 50s
Windows GCC auto-bit wide limbs C++20	3m 15s
Windows GCC 32-bit wide limb C++20	2m 52s
Windows GCC 16-bit wide limbs C++20	3m 0s
Linux Clang auto-bit wide limbs C++20	29s
Linux Clang 32-bit wide limb C++20	30s
Linux Clang 16-bit wide limbs C++20	36s
Linux GCC auto-bit wide limbs C++20	33s
Linux GCC 32-bit wide limb C++20	31s
Linux GCC 16-bit wide limbs C++20	36s
Linux UNIX-POSIX auto-bit wide limbs C++20	29s
Linux UNIX-POSIX 32-bit wide limb C++20	26s
Linux UNIX-POSIX 16-bit wide limbs C++20	26s
MacOS XCode auto-bit wide limbs C++20	30s
MacOS XCode 32-bit wide limb C++20	23s
MacOS XCode 16-bit wide limbs C++20	30s
MacOS Clang auto-bit wide limbs C++20	24s
MacOS Clang 32-bit wide limb C++20	27s
MacOS Clang 16-bit wide limbs C++20	23s
	45m 23s

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