Python clang package recognizes std::string_view as int

The pip package [clang](https://pypi.org/project/clang/) recognizes the C++ standard library type `std::string_view` as `int`.

Reproduce:

```cpp
#include

std::string_view str_view_global;

struct TestStruct {
std::string_view str_view;
};
```

```python
import clang.cindex

index = clang.cindex.Index.create()
tu = index.parse(
"test.cpp",
options=clang.cindex.TranslationUnit.PARSE_DETAILED_PROCESSING_RECORD
)

if tu is None or tu.cursor is None:
raise RuntimeError("Failed to parse C++ file.")

for cursor in tu.cursor.get_children():
if cursor.spelling == "str_view_global":
print(cursor.type.spelling, cursor.spelling)
if cursor.kind == clang.cindex.CursorKind.STRUCT_DECL and cursor.spelling == "TestStruct":
for field in cursor.get_children():
if field.kind != clang.cindex.CursorKind.FIELD_DECL:
continue
print(field.type.spelling, field.spelling)
```

Output:

```
❯ python ./test.py
int str_view_global
int str_view
```

Version info:

```
❯ pip show clang
Name: clang
Version: 20.1.5
Summary: libclang python bindings
Home-page: http://clang.llvm.org/
Author: LLVM team - pypi upload by Loic Jaquemet
Author-email:
License: Apache-2.0 with LLVM exception
Location: /home/oppositenormal/miniforge3/envs/white-bird-engine/lib/python3.12/site-packages
Requires:
Required-by:
```

Start by running the Python reproduction in test.py and inspect how clang.cindex reports the types of the global and struct field. Trace the type-spelling path for std::string_view; done means both reported types are std::string_view rather than int.

Written by the indexing model from the issue text.