parser,checker: vls skip unrelated files

[kbkpbot]

This is discussed at #25519

This PR skip all other files except the user file itself.
Hope this can speedup the vls process.

[kbkpbot]

The CI fail with (https://github.com/vlang/v/actions/runs/18616692038/job/53082198478?pr=25531)

v -o v.c cmd/v
  gcc -Werror -municode -w v.c -lws2_32
  shell: C:\Program Files\PowerShell\7\pwsh.EXE -command ". '{0}'"
  env:
    VFLAGS: -cc gcc
Error: v.c:568:44: error: two or more data types in declaration specifiers
  568 |                                 typedef u8 bool;
      |                                            ^~~~
Error: Process completed with exit code 1.

It seems that in latest gcc, bool become an internal datatype? Because I compile following c code, has no problem at all:

int main() {
    bool test = 1;
    (void)test;
    return 0;
}

So I suggest change the CI command to :

gcc -Werror -municode -w v.c -lws2_32 -std=c99

[JalonSolov]

That would make sense. The latest C standard did, indeed, introduce BOOL as a real datatype, not just a #define.