Improve error message for MSRV error

[acheroncrypto]

Problem

The error message for MSRV is misleading because the error results from the version of rustc that ships with solana platform-tools and not the system's rustc.

error: package `winnow v0.4.4` cannot be built because it requires rustc 1.64.0 or newer, while the currently active rustc version is 1.62.0-dev

This is confusing and people rightfully think they should update rust when the actual problem is that solana build tools are outdated.

Proposed Solution

Show a better error message.

error: package `winnow v0.4.4` cannot be built because it requires rustc 1.64.0 or newer, while the currently active rustc version is 1.62.0-dev

Note that this is the rustc version that ships with solana and not your system's rustc version.

Use `solana-install update` or head over to https://docs.solana.com/cli/install-solana-cli-tools to install a newer version.

[pindaroso]

How did you end up fixing this? Should the Solana version be updated? I ran solana-install update to no avail. On MacOS 3.8 GHz 8-Core Intel Core i7.

[acheroncrypto]

How did you end up fixing this? Should the Solana version be updated? I ran solana-install update to no avail. On MacOS 3.8 GHz 8-Core Intel Core i7.

We essentially need a new Solana release to fully solve this problem but in the short term you can either fix this by using a fixed version for problematic crates like this or building the master branch from source since it's not yet released.

The v1.14 branch seems to be getting updated still so I think we'll get 1.14.18 release soon but that's still using rustc 1.62.0-dev. There's PR #31418 to update it on v1.14 branch but it has no traction yet.