Fix: Properly check whether the so_reuseport socket option is available (#4579)

* Try to properly check if so_reuseport is available

* io_uring "support"

* comment out io_uring, for now

* Make IO_uring opt-in via `-DGeyser.io_uring=true` flag

* dont include io_uring

* oops - bungee 

editing on mobile is hard

* oops - spigot

* oops - velocity

* properly exclude all io_uring on all platforms except standalone

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Co-authored-by: Kas-tle <26531652+Kas-tle@users.noreply.github.com>

bootstrap/viaproxy/build.gradle.kts

@@ -22,6 +22,7 @@ tasks.withType<com.github.jengelman.gradle.plugins.shadow.tasks.ShadowJar> {
     dependencies {
         exclude(dependency("com.google.*:.*"))
         exclude(dependency("io.netty:.*"))
+        exclude(dependency("io.netty.incubator:.*"))
         exclude(dependency("org.slf4j:.*"))
         exclude(dependency("org.ow2.asm:.*"))
     }