Fix clang build error browser64.test_pthread_malloc. NFC #25051
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A recent clang change started generating this warning/error:
```
test_pthread_malloc (test_browser.browser64.test_pthread_malloc) ... /usr/local/google/home/sbc/dev/wasm/emscripten/test/pthread/test_pthread_malloc.c:19:21: error: allocation of insufficient size '4' for type 'long' with size '8'
[-Werror,-Walloc-size]
19 | mem[i] = (long*)malloc(4);
| ^
1 error generated.
```
Also simplify the test a little.
dschuff
approved these changes
Aug 25, 2025
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A recent clang change started generating this warning/error:
Also simplify the test a little.