build: make history immutable to arcanist on stable branch

Summary:
build: make history immutable to arcanist on stable branch

fix: removed clang-format-linter from the load field on .arconfig

Test Plan: TBD

Reviewers: jcmcdonald

Reviewed By: jcmcdonald

Tags: #goldilocks_project, #programming_dept

Differential Revision: https://phab.mousepawmedia.com/D506

.arcconfig

@@ -1,9 +1,9 @@
 {
+	"history.immutable" : true,
 	"phabricator.uri" : "https://phab.mousepawmedia.com",
 	"repository.callsign" : "G",
 	"load" : [
-		".arclibs/cppcheck",
-		".arclibs/clang-format-linter"
+		".arclibs/cppcheck"
 	],
 	"phutil_libraries": [
    		 ".arclib"