[clang] [analyzer] Fix 'bstring.c' test on Mingw (PR #192252)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: Balázs Benics (steakhal)

<details>
<summary>Changes</summary>

We can't just `_WIN32` macro because it's not present on Mingw.

Addresses https://github.com/llvm/llvm-project/pull/191061#issuecomment-4250948488

Co-authored-by: Martin Storsjö <martin@<!-- -->martin.st>

---
Full diff: https://github.com/llvm/llvm-project/pull/192252.diff


1 Files Affected:

- (modified) clang/test/Analysis/bstring.c (+1-1) 


``````````diff
diff --git a/clang/test/Analysis/bstring.c b/clang/test/Analysis/bstring.c
index f343aaec43307..7e2ee1af006af 100644
--- a/clang/test/Analysis/bstring.c
+++ b/clang/test/Analysis/bstring.c
@@ -539,7 +539,7 @@ void nocrash_on_locint_offset(void *addr, void* from, struct S s) {
 void nocrash_on_empty_struct_memcpy(void) {
   struct {} a[10];
   __builtin_memcpy(&a[2], a, 2); // no-crash
-#if !defined(_WIN32)
+#if defined(__GNUC__)
   // expected-warning at -2 {{'memcpy' will always overflow; destination buffer has size 0, but size argument is 2}}
   // expected-warning at -3 {{Memory copy function overflows the destination buffer}}
 #endif

``````````

</details>


https://github.com/llvm/llvm-project/pull/192252