There's a merged pull request on the void-packages repository

SDL2_ttf: update to 2.20.1.
https://github.com/void-linux/void-packages/pull/41671

Description:
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#### Testing the changes
- I tested the changes in this PR: **briefly**


#### Local build testing
```
SUMMARY
pkg       host         target        cross  result
SDL2_ttf  x86_64       x86_64        n      OK
SDL2_ttf  x86_64-musl  x86_64-musl   n      OK
SDL2_ttf  i686         i686          n      OK
SDL2_ttf  x86_64-musl  aarch64-musl  y      OK
SDL2_ttf  x86_64-musl  aarch64       y      OK
SDL2_ttf  x86_64-musl  armv7l-musl   y      OK
SDL2_ttf  x86_64-musl  armv7l        y      OK
SDL2_ttf  x86_64-musl  armv6l-musl   y      OK
SDL2_ttf  x86_64-musl  armv6l        y      OK
```