[interop][SwiftToCxx] remove extraneous ';' from generated header

Author: hyp

lib/PrintAsClang/PrintClangValueType.cpp

@@ -130,7 +130,7 @@ static void addCppExtensionsToStdlibType(const NominalTypeDecl *typeDecl,
                    "memcpy(&result._3, value + 8, 4);\n"
                    "#endif\n"
                    "return result;\n"
-                   "};\n";
+                   "}\n";
     cPrologueOS << "SWIFT_EXTERN void *_Nonnull "
                    "$sSS10FoundationE19_bridgeToObjectiveCSo8NSStringCyF(swift_interop_stub_"
                    "Swift_String) SWIFT_NOEXCEPT SWIFT_CALL;\n";

test/Interop/SwiftToCxx/stdlib/swift-stdlib-in-cxx.swift

@@ -2,7 +2,7 @@
 // RUN: %target-swift-frontend -parse-as-library %platform-module-dir/Swift.swiftmodule/%module-target-triple.swiftinterface -enable-library-evolution -disable-objc-attr-requires-foundation-module -typecheck -module-name Swift -parse-stdlib -enable-experimental-cxx-interop -emit-clang-header-path %t/Swift.h  -experimental-skip-all-function-bodies
 // RUN: %FileCheck %s < %t/Swift.h
 
-// RUN: %check-interop-cxx-header-in-clang(%t/Swift.h -DSWIFT_CXX_INTEROP_HIDE_STL_OVERLAY -Wno-unused-private-field -Wno-unused-function)
+// RUN: %check-interop-cxx-header-in-clang(%t/Swift.h -DSWIFT_CXX_INTEROP_HIDE_STL_OVERLAY -Wno-unused-private-field -Wno-unused-function -Wc++98-compat-extra-semi)
 
 // CHECK: namespace Swift __attribute__((swift_private)) SWIFT_SYMBOL_MODULE("Swift") {