8317327: Remove JT_JAVA dead code in jib-profiles.js

Reviewed-by: erikj, jwaters

make/conf/jib-profiles.js

@@ -945,10 +945,7 @@ var getJibProfilesProfiles = function (input, common, data) {
             target_os: input.build_os,
             target_cpu: input.build_cpu,
             dependencies: [ "jtreg", "gnumake", "boot_jdk", "devkit", "jib" ],
-            labels: "test",
-            environment: {
-                "JT_JAVA": common.boot_jdk_home
-            }
+            labels: "test"
         }
     };
     profiles = concatObjects(profiles, testOnlyProfiles);