[lldb][test] TestDataFormatterLibcxxOptionalSimulator.py: don't use __builtin_printf

This caused Windows CI to fail with:
```
Build Command Output:

make: Entering directory 'C:/Users/tcwg/llvm-worker/lldb-aarch64-windows/build/lldb-test-build.noindex/functionalities/data-formatter/data-formatter-stl/libcxx-simulators/optional/TestDataFormatterLibcxxOptionalSimulator.test_r0'

"C:\Users\tcwg\llvm-worker\lldb-aarch64-windows\build\bin\clang++.exe"  -std=c++11 -gdwarf -O0   -IC:\Users\tcwg\llvm-worker\lldb-aarch64-windows\llvm-project\lldb\packages\Python\lldbsuite\test\make/../../../../..//include -IC:/Users/tcwg/llvm-worker/lldb-aarch64-windows/build/tools/lldb/include -IC:\Users\tcwg\llvm-worker\lldb-aarch64-windows\llvm-project\lldb\test\API\functionalities\data-formatter\data-formatter-stl\libcxx-simulators\optional -IC:\Users\tcwg\llvm-worker\lldb-aarch64-windows\llvm-project\lldb\packages\Python\lldbsuite\test\make -include C:\Users\tcwg\llvm-worker\lldb-aarch64-windows\llvm-project\lldb\packages\Python\lldbsuite\test\make/test_common.h -fno-limit-debug-info    -fno-exceptions -D_HAS_EXCEPTIONS=0 -fms-compatibility-version=19.0 -std=c++14  -DREVISION=0 -std=c++14 --driver-mode=g++ -MT main.o -MD -MP -MF main.d -c -o main.o C:\Users\tcwg\llvm-worker\lldb-aarch64-windows\llvm-project\lldb\test\API\functionalities\data-formatter\data-formatter-stl\libcxx-simulators\optional/main.cpp

C:\Users\tcwg\llvm-worker\lldb-aarch64-windows\build\bin\clang.exe main.o -gdwarf -O0   -IC:\Users\tcwg\llvm-worker\lldb-aarch64-windows\llvm-project\lldb\packages\Python\lldbsuite\test\make/../../../../..//include -IC:/Users/tcwg/llvm-worker/lldb-aarch64-windows/build/tools/lldb/include -IC:\Users\tcwg\llvm-worker\lldb-aarch64-windows\llvm-project\lldb\test\API\functionalities\data-formatter\data-formatter-stl\libcxx-simulators\optional -IC:\Users\tcwg\llvm-worker\lldb-aarch64-windows\llvm-project\lldb\packages\Python\lldbsuite\test\make -include C:\Users\tcwg\llvm-worker\lldb-aarch64-windows\llvm-project\lldb\packages\Python\lldbsuite\test\make/test_common.h -fno-limit-debug-info     -fuse-ld=lld  --driver-mode=g++ -o "a.out"

lld-link: error: undefined symbol: printf

>>> referenced by main.o:(main)

clang: error: linker command failed with exit code 1 (use -v to see invocation)

make: *** [Makefile.rules:515: a.out] Error 1

make: Leaving directory 'C:/Users/tcwg/llvm-worker/lldb-aarch64-windows/build/lldb-test-build.noindex/functionalities/data-formatter/data-formatter-stl/libcxx-simulators/optional/TestDataFormatterLibcxxOptionalSimulator.test_r0'
```

Author: Michael137

lldb/test/API/functionalities/data-formatter/data-formatter-stl/libcxx-simulators/optional/main.cpp

@@ -99,6 +99,5 @@ class optional : private __optional_move_assign_base<_Tp>,
 int main() {
   std::__lldb::optional<char const *> maybe_string{"Hello"};
   std::__lldb::optional<int> maybe_int{42};
-  __builtin_printf("Break here\n");
-  return 0;
+  return 0; // Break here
 }