Safe determining Kotlin/Native meta version

shared/buildSrc/src/main/kotlin/org/jetbrains/kotlin/VersionGenerator.kt

@@ -98,7 +98,7 @@ open class VersionGenerator: DefaultTask() {
                    |       Regex(""${'"'}([0-9]+)\.([0-9]+)(?:\.([0-9]+))?(?:-(\p{Alpha}\p{Alnum}*))?(?:-([0-9]+))?""${'"'})
                    |         .matchEntire(this)!!.destructured
                    |    return KonanVersionImpl(
-                   |      MetaVersion.valueOf(meta.toUpperCase()),
+                   |      MetaVersion.findAppropriate(meta),
                    |      major.toInt(),
                    |      minor.toInt(),
                    |      maintenance.toIntOrNull() ?: 0,

shared/src/main/kotlin/org/jetbrains/kotlin/konan/MetaVersion.kt

@@ -30,5 +30,12 @@ enum class MetaVersion(val metaString: String) {
     BETA("beta"),
     RC1("rc1"),
     RC2("rc2"),
-    RELEASE("release")
+    RELEASE("release");
+
+    companion object {
+
+        fun findAppropriate(metaString: String): MetaVersion {
+            return MetaVersion.values().find { it.metaString.equals(metaString, ignoreCase = true) } ?: RELEASE
+        }
+    }
 }