replace usage of `sys.stdout.encoding` with `sys.getdefaultencoding()`

In some environments, `sys.stdout.encoding` may return `None`. This is encountered when knitting an rmarkdown document using the reticulate engine. In that context, `sys.stdout` is replaced with a `StringIO()` object to capture all output. `StringIO().encoding` returns `None` closes https://github.com/rstudio/reticulate/issues/1508

replace usage of `sys.stdout.encoding` with `sys.getdefaultencoding()`
353c734c · Tomasz Kalinowski · Luciano Paz · b63ee0cd · 353c734c
--- a/pytensor/link/c/cmodule.py
+++ b/pytensor/link/c/cmodule.py
@@ -2743,7 +2743,7 @@ def default_blas_ldflags():

        maybe_lib_dirs = [
            [pathlib.Path(p).resolve() for p in line[len("libraries: =") :].split(":")]
-            for line in stdout.decode(sys.stdout.encoding).splitlines()
+            for line in stdout.decode(sys.getdefaultencoding()).splitlines()
            if line.startswith("libraries: =")
        ]
        if len(maybe_lib_dirs) > 0: