Tweak .clang-format configuration.

Remove the custom configuration options for brace wrapping. They
don't work well for inline functions or type-traits classes.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@291998 91177308-0d34-0410-b5e6-96231b3b80d8

.clang-format

@@ -4,11 +4,6 @@ BasedOnStyle: LLVM
 Language: Cpp
 
 AlwaysBreakTemplateDeclarations: true
-AllowShortFunctionsOnASingleLine: Inline
-BreakBeforeBraces: Custom
-BraceWrapping:
-  AfterClass: true
-  AfterFunction: true
 PointerAlignment: Left
 
 # Disable formatting options which may break tests.