Rollup merge of #141446 - psumbera:2nd-maintainer, r=RalfJung

Add 2nd Solaris target maintainer

Based on concenr here rust-lang/compiler-team#870 (comment) I propose my coleague ```@kulikjak``` as 2nd Solaris maintainer. He already did some work to Rust in past.

Author: matthiaskrgr

src/doc/rustc/src/platform-support/solaris.md

@@ -8,6 +8,7 @@ Rust for Solaris operating system.
 ## Target maintainers
 
 [@psumbera](https://github.com/psumbera)
+[@kulikjak](https://github.com/kulikjak)
 
 ## Requirements