TST Remove upstreamed memfsmtime emscripten test (#1241)

The patch is upstreamed and so are tests.

emsdk/tests/test_memfsmtime.py

@@ -1,75 +0,0 @@
-import subprocess
-from . import common
-
-
-def test_memfsmtime(tmpdir):
-    with tmpdir.as_cwd():
-        with open("main.c", "w") as f:
-            f.write(
-                r"""\
-#include <assert.h>
-#include <fcntl.h>
-#include <stdlib.h>
-#include <string.h>
-#include <time.h>
-#include <unistd.h>
-#include <sys/stat.h>
-
-void mysleep(int delta)
-{
-    time_t end = time(NULL) + delta;
-
-    while (time(NULL)<end);
-}
-
-time_t getmtime(char *fname)
-{
-    struct stat buf;
-
-    stat(fname, &buf);
-    return buf.st_mtime;
-}
-
-void writefile(char *fname, char *content)
-{
-    int fd = open(fname, O_CREAT | O_TRUNC | O_WRONLY, 0777);
-
-    write(fd, content, strlen(content));
-    close(fd);
-}
-
-int main(int argc, char *argv[])
-{
-    char tmpdir[64] = "/tmp/tmpXXXXXXX";
-    char fname[64];
-    time_t t0, t1, t2, t3;
-
-    mkdtemp(tmpdir);
-    strcpy(fname, tmpdir);
-    strcat(fname, "/foo.py");
-    t0 = getmtime(tmpdir);
-    mysleep(1);
-    writefile(fname, "bar = 54\n");
-    t1 = getmtime(tmpdir);
-    t2 = getmtime(fname);
-    assert(t1 > t0);
-    assert(t1 == t2);
-    mysleep(1);
-    unlink(fname);
-    t3 = getmtime(tmpdir);
-    assert(t3 > t1);
-}
-"""
-            )
-
-        subprocess.run(
-            [
-                "emcc",
-                "-s",
-                "MAIN_MODULE=1",
-                "main.c",
-            ],
-            check=True,
-        )
-        out = subprocess.run(["node", "a.out.js"], capture_output=True, check=False)
-        assert out.returncode == 0