Add the required OptIn annotations

Author: dkhalanskyjb

core/linux/src/TimeZoneNative.kt

@@ -57,15 +57,16 @@ internal actual class RegionTimeZone(private val tzid: TimeZoneRules, actual ove
     actual override fun offsetAtImpl(instant: Instant): UtcOffset = tzid.infoAtInstant(instant)
 }
 
+@OptIn(kotlinx.cinterop.UnsafeNumber::class)
 internal actual fun currentTime(): Instant = memScoped {
     val tm = alloc<timespec>()
     val error = clock_gettime(CLOCK_REALTIME, tm.ptr)
     if (error != 0) {
         val errorStr: String = strerror(errno)?.toKString() ?: "Unknown error"
         throw IllegalStateException("Could not obtain the current clock readings from the system: $errorStr")
     }
-    val seconds: Long = tm.tv_sec
-    val nanoseconds: Int = tm.tv_nsec.toInt()
+    val seconds: Long = tm.tv_sec.convert<Long>()
+    val nanoseconds: Int = tm.tv_nsec.convert<Int>()
     try {
         require(nanoseconds in 0 until NANOS_PER_ONE)
         return Instant(seconds, nanoseconds)

core/nix/src/internal/filesystem.kt

@@ -8,6 +8,7 @@ package kotlinx.datetime.internal
 import kotlinx.cinterop.*
 import platform.posix.*
 
+@OptIn(kotlinx.cinterop.UnsafeNumber::class)
 internal class Path(val isAbsolute: Boolean, val components: List<String>) {
     fun check(): PathInfo? = memScoped {
         val stat = alloc<stat>()
@@ -81,7 +82,7 @@ internal fun Path.traverseDirectory(exclude: Set<String> = emptySet(), stripLead
     }
 }
 
-
+@OptIn(kotlinx.cinterop.UnsafeNumber::class)
 internal fun Path.readBytes(): ByteArray {
     val handler = fopen(this.toString(), "rb") ?: throw RuntimeException("Cannot open file $this")
     try {