React Native 0.81 support

[prathameshmm02]

Add support for React Native 0.81, contains following fixes:

• Upgrade libsodium to 1.0.20 (contains 16KB alignment fix for libsodium.so)
• Enable 16KB native library alignment
• Update C++ standard to C++20 in CMakeLists.txt
• Fix an issue due to folly dep when prebuild RN deps are enabled

[landabaso]

Signature verification fails.
The signature file does not match [the one distributed in the original repo]
/cc @nikgraf

[landabaso]

I’m on RN 0.79.5. This PR fixes Folly deps by adding:

if ENV['RCT_USE_RN_DEP'] != '1'
  s.dependency 'RCT-Folly', folly_version
end

However, pod install fails with:

[!] Invalid `react-native-libsodium.podspec` file: undefined local variable or method `folly_version' for module Pod.

Suggestion: drop the variable and rely on CocoaPods resolution:

s.dependency 'RCT-Folly'

This works on RN 0.79.5. Not sure about 0.8x.
/cc @nikgraf

[prathameshmm02]

Removed folly_version, oh my mindless copy pasting. Also timestamp of the signature file is 1758756827 (25th September), it was recently updated, current version's (1.0.19) signature also does not match btw.

[landabaso]

Thanks @prathameshmm02. Why not update the .minisig file as well? The script downloads the latest .tar.gz, and without the matching signature it won't be able to proceed. The tar.gz file has changed since your initial commit.

[howardleejh]

Hi, following up on this, is it still in progress?

[prathameshmm02]

Waiting on @nikgraf to review this.

[tgreco]

Thanks @prathameshmm02. Why not update the .minisig file as well? The script downloads the latest .tar.gz, and without the matching signature it won't be able to proceed. The tar.gz file has changed since your initial commit.

@prathameshmm02 whats your thoughts on this question? I think it's a valid concern

[prathameshmm02]

Libsodium tarballs update frequently, I can't keep updating the build, it might update next week, last update was today.

Note: Check the timestamp in the minisig file not in the index of releases.

[nikgraf]

Looks good, thanks for fixing! Will update the minisig and signature myself afterwards