Fix warnings linux eventloops2

[rukai]

• Tested on all platforms changed
• Added an entry to CHANGELOG.md if knowledge of this change could be valuable to users
• Updated documentation to reflect any user-facing changes, including notes of platform-specific behavior
• Created an example program if it would help users understand this functionality
• Updated feature matrix, if new features were added or implemented

warning: attribute must be of the form `#[link(name = "...", /*opt*/ kind = "dylib|static|...",
                                             /*opt*/ cfg = "...")]`
 --> src/platform/linux/dlopen.rs:9:1
  |
9 | #[link="dl"]
  | ^^^^^^^^^^^^
  |
  = note: #[warn(ill_formed_attribute_input)] on by default
  = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
  = note: for more information, see issue #57571 <https://github.com/rust-lang/rust/issues/57571>

[rukai]

As requested in #879
Feel free to close the original PR or do whatever.
I didn't realize development was happening in a separate branch for now.

[goddessfreya]

Thank you!