Disable NewInference for stdlib tests

There is one failing test namely `ValByMapExtensionsTest.doTest`, which
 is quite questionable because its checks the use of out projection and
 Exact annotation (see KT-18789)

libraries/stdlib/jdk7/build.gradle

@@ -94,7 +94,8 @@ compileTestKotlin {
             "-Xmulti-platform",
             "-Xuse-experimental=kotlin.Experimental",
             "-Xuse-experimental=kotlin.ExperimentalUnsignedTypes",
-            "-Xuse-experimental=kotlin.ExperimentalStdlibApi"
+            "-Xuse-experimental=kotlin.ExperimentalStdlibApi",
+            "-XXLanguage:-NewInference"
     ]
 }