[K/N] Fix general case of KT-49827

When loading default libraries, the code assumed that all subdirectories
of <kotlin native home>/klib/*/ corresponded to valid libraries. The bug
report only considers the case of .DS_STORE, which is generated by
Finder on MacOS, but this case has already been accounted for in the
code.

The fix filters out all subdirectories that are not stdlib and don’t have the
“org.jetbrains.kotlin” prefix. 

Co-authored-by: Troels Lund <troels@google.com>

compiler/util-klib/src/org/jetbrains/kotlin/library/SearchPathResolver.kt

@@ -187,10 +187,11 @@ abstract class KotlinLibrarySearchPathResolver<L : KotlinLibrary>(
     val defaultRoots: List<File>
         get() = listOfNotNull(distHead, distPlatformHead).filter { it.exists }
 
-    private fun getDefaultLibrariesFromDir(directory: File) =
+    private fun getDefaultLibrariesFromDir(directory: File, prefix: String = "org.jetbrains.kotlin") =
         if (directory.exists) {
             directory.listFiles
                 .asSequence()
+                .filter { it.name.startsWith(prefix) }
                 .filterNot { it.name.startsWith('.') }
                 .filterNot { it.name.removeSuffixIfPresent(KLIB_FILE_EXTENSION_WITH_DOT) == KOTLIN_STDLIB_NAME }
                 .map { UnresolvedLibrary(it.absolutePath, null) }