Without the change build fails on` master as
https://hydra.nixos.org/build/249116447:
blockalign_src/crc.cpp: In function 'bool cryptopp_crc::IsAlignedOn(const void*, unsigned int)':
blockalign_src/crc.cpp:191:23: error: 'uintptr_t' does not name a type
191 | const uintptr_t x = reinterpret_cast<uintptr_t>(ptr);
| ^~~~~~~~~
