deps: uvwasi: cherry-pick 941bedf

Original commit message:

    nodejs/uvwasi@20fd9e2 was
    accidentally reverted in
    nodejs/uvwasi#73. This commit
    relands it.

PR-URL: #31363
Reviewed-By: David Carlier <devnexen@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>

deps/uvwasi/src/uvwasi.c

@@ -9,6 +9,7 @@
 # include <time.h>
 # define IS_SLASH(c) ((c) == '/')
 #else
+# include <io.h>
 # define IS_SLASH(c) ((c) == '/' || (c) == '\\')
 #endif /* _WIN32 */