adjust build targets

[hanwencheng]

Thanks for the template and clear explaination on Medium!

This PR adjusts (adds and removes) some targets

Android

Add support for x86_64_linux, closes #3

iOS

remove 32 bits target: i386, armb7s, armv7 targets

because:

From 1.42.0 rust dropped 32-bit apple target support), the latest version for building ios target is 1.41.1.

In addition to that, as of Xcode 10 (10A255) - September 17, 2018, i386 architecture is no longer supported.

References of ios archs and devices could be refer here.

[hanwencheng]

I runned make target/x86-64-linux-android/release/libexample.so but it seems nothing happens, any steps did I miss?

[brickpop]

Hi @hanwencheng and thank you for the contribution.

As said on the issue discussion, I think it would be best to leave all recent targets available (except i386 ios) and explain how to remove the deprecated ones (if needed) in the Readme

I runned make target/x86-64-linux-android/release/libexample.so but it seems nothing happens, any steps did I miss?

Did you run make init to get all targets available locally? Did you touch the source file to force make rebuild the target?

[brickpop]

Could you please split this line into the currently supported iOS targets (aarch64, x86_64) and the deprecated ones (skipping i386)? This would allow anyone with legacy plugins to still be able to fetch all targets from Rust 1.41.1

[brickpop]

I runned make target/x86-64-linux-android/release/libexample.so but it seems nothing happens, any steps did I miss?

Also, I think that your PR is missing the symbolic link to x86_64 on Android (JNI)

https://github.com/brickpop/flutter-rust-ffi/pull/10/files#diff-a944420e30ab791bdcdae4b59b0a627bR1

PR #10 is a duplicate of this one, but it includes the modification linked above, which is also needed.

Thank you

[brickpop]

Merged #10 instead, since there was no response about the changes requested