[cxx-interop] Make two tests less restrictive

libc++ has decls that are declared outside of `inline namespace __1`, which might be printed before it.

Author: egorzhdan

test/Interop/Cxx/stdlib/print-libcxx-module-interface.swift

@@ -3,7 +3,7 @@
 // REQUIRES: OS=macosx
 
 // CHECK: enum std {
-// CHECK-NEXT: enum __1 {
+// CHECK: enum __1 {
 
 // CHECK: typealias string =
 

test/Interop/Cxx/symbolic-imports/print-libcxx-symbolic-module-interface.swift

@@ -8,7 +8,7 @@
 // REQUIRES: OS=macosx
 
 // CHECK: enum std {
-// CHECK-NEXT: enum __1 {
+// CHECK: enum __1 {
 
 // STRING: struct basic_string {