[clang] [clang][analyzer] StreamChecker: Model getc, vfscanf, putc, vfprintf (PR #82476)

[Balázs Kéri via cfe-commits]

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@@ -65,12 +65,24 @@ void check_fseek(void) {
   fclose(fp);
 }
 
+void check_fseeko(void) {
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balazske wrote:

If we have these null pointer tests for all functions, `vfprintf` and `vfscanf` could be added too.

https://github.com/llvm/llvm-project/pull/82476