Exclude emscripten/pybuilddir.txt from the crate package

fixes #5431

Signed-off-by: Nik Konyuchenko <[email protected]>

Author: nikkon-dev

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "pyo3"
-version = "0.26.0"
+version = "0.26.1"
 description = "Bindings to Python interpreter"
 authors = ["PyO3 Project and Contributors <https://github.com/PyO3>"]
 readme = "README.md"
@@ -20,6 +20,7 @@ exclude = [
     "/.github",
     "/tests/test_compile_error.rs",
     "/tests/ui",
+    "/emscripten/pybuilddir.txt",
 ]
 edition = "2021"
 rust-version.workspace = true