Remove backport configuration from desugared library

As of https://github.com/google/desugar_jdk_libs/commit/8ffa7f97f5e3875852cfe4e1c638a6aff6719093
the desugared library no longer uses [Math|Integer|Long|Double]8
but just [Math|Integer|Long|Double].

Change-Id: I80c5d4b344b2b8955fbe36daa49d14368f2fec88
diff --git a/src/library_desugar/desugar_jdk_libs.json b/src/library_desugar/desugar_jdk_libs.json
index dc7ac7b..3a9c0b4 100644
--- a/src/library_desugar/desugar_jdk_libs.json
+++ b/src/library_desugar/desugar_jdk_libs.json
@@ -2,7 +2,7 @@
   "configuration_format_version": 3,
   "group_id" : "com.tools.android",
   "artifact_id" : "desugar_jdk_libs",
-  "version": "1.1.4",
+  "version": "1.1.5",
   "required_compilation_api_level": 26,
   "synthesized_library_classes_package_prefix": "j$.",
   "support_all_callbacks_from_library": true,
@@ -77,12 +77,6 @@
         "java.time.": "j$.time.",
         "java.util.Desugar": "j$.util.Desugar"
       },
-      "backport": {
-        "java.lang.Double8": "java.lang.Double",
-        "java.lang.Integer8": "java.lang.Integer",
-        "java.lang.Long8": "java.lang.Long",
-        "java.lang.Math8": "java.lang.Math"
-      },
       "retarget_lib_member": {
         "java.util.Date#toInstant": "java.util.DesugarDate",
         "java.util.GregorianCalendar#toZonedDateTime": "java.util.DesugarGregorianCalendar",