Fix #22667: hdrgen: Skip using typedefIdent for basic types

[IDONTUSEGH]

When generating .di files from ImportC code, a typedef like typedef void _IO_lock_t; would cause all subsequent uses of void to incorrectly print as _IO_lock_t in function signatures.

Fixes #22667

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Testing this PR locally

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[thewilsonator]

Please add the test case from the linked issue, otherwise looks great!

[IDONTUSEGH]

I now have doubt after the test failed with my initial change, skipping for void fixes my specific use case but is just a hack, the following will fail:

typedef int _IO_lock_t;
int mylib_hello(void);

This may be related: #20889

cc @dkorpel

Both my C & D are rusty, so I may be missing something obvious..

[IDONTUSEGH]

Ok i figured it out, it was reusing the global shared basic type instances (Type.tvoid, Type.tint32, etc.) when creating typedefs.

When insertTypedefToTypedefTab() set typedefIdent on these types, it was directly mutating the shared instance, causing ALL subsequent uses of void or int to appear as the typedef name in the generated .di

[thewilsonator]

Thanks for figuring this out.

[thewilsonator]

Otherwise looks great