Avoid adding duplicated items in systemLib soSource

Summary: This diff simply uses `Set<String>`  to avoid adding same path in systemLib soSource.

Reviewed By: charles011

Differential Revision: D32052024

fbshipit-source-id: 90810a061becd4c5ae4584640e05819272d8753c

java/com/facebook/soloader/SoLoader.java

@@ -447,7 +447,8 @@ private static void AddSystemLibSoSource(ArrayList<SoSource> soSources, String[]
       systemLibPaths += ":" + LD_LIBRARY_PATH;
     }
 
-    for (String libPath : systemLibPaths.split(":")) {
+    final Set<String> libPathSet = new HashSet<>(Arrays.asList(systemLibPaths.split(":")));
+    for (String libPath : libPathSet) {
       // Don't pass DirectorySoSource.RESOLVE_DEPENDENCIES for directories we find on
       // LD_LIBRARY_PATH: Bionic's dynamic linker is capable of correctly resolving dependencies
       // these libraries have on each other, so doing that ourselves would be a waste.