Add support for IBM ppc 64 little endian (#628)

Author: PeterDubec

src/main/java/org/xerial/snappy/OSInfo.java

@@ -44,6 +44,7 @@ public class OSInfo {
     public static final String IA64 = "ia64";
     public static final String PPC = "ppc";
     public static final String PPC64 = "ppc64";
+    public static final String PPC64LE = "ppc64le";
     public static final String IBMZ = "s390";
     public static final String IBMZ_64 = "s390x";
     public static final String AARCH_64 = "aarch64";
@@ -80,6 +81,9 @@ public class OSInfo {
         archMapping.put("power_pc", PPC);
         archMapping.put("power_rs", PPC);
 
+        //PowerPC 64bit Little Endian mappings
+        archMapping.put(PPC64LE, PPC64LE);
+
         // TODO: PowerPC 64bit mappings
         archMapping.put(PPC64, PPC64);
         archMapping.put("power64", PPC64);