fix(clang-format): Don't indent extern blocks with new clang-format

* cf. https://bugs.llvm.org/show_bug.cgi?id=37272

Depends-On: 24735
Change-Id: I41ba1142a61a94977b3471baf9415ce1c4fb2df0

clang-format

@@ -9,11 +9,32 @@ BasedOnStyle: Mozilla
 BinPackArguments: true
 BinPackParameters: false
 BreakConstructorInitializers: AfterColon
+BreakBeforeBraces: Custom
+BraceWrapping:
+  AfterCaseLabel:  false
+  AfterClass:      true
+  AfterControlStatement: Never
+  AfterEnum:       true
+  AfterFunction:   true
+  AfterNamespace:  false
+  AfterObjCDeclaration: false
+  AfterStruct:     true
+  AfterUnion:      true
+  AfterExternBlock: false
+  BeforeCatch:     false
+  BeforeElse:      false
+  BeforeLambdaBody: false
+  BeforeWhile:     false
+  IndentBraces:    false
+  SplitEmptyFunction: true
+  SplitEmptyRecord: false
+  SplitEmptyNamespace: true
 ColumnLimit: 100
 ConstructorInitializerAllOnOneLineOrOnePerLine: true
 ConstructorInitializerIndentWidth: 4
 ContinuationIndentWidth: 4
 Cpp11BracedListStyle: true
+IndentExternBlock: false
 IndentWidth: 4
 KeepEmptyLinesAtTheStartOfBlocks: false
 Language: Cpp