windows: Fix path for file sanitization

```
> c:\
> cd /windows
```

Are valid paths. Paths starting with '\' or '/' should be considered
absolute paths.

Reviewed-by: Vincent Torri <vincent.torri@gmail.com>
Reviewed-by: João Paulo Taylor Ienczak Zanette <joao.tiz@expertisesolutions.com.br>
Reviewed-by: Stefan Schmidt <stefan@datenfreihafen.org>
Differential Revision: https://phab.enlightenment.org/D12022

src/lib/evil/evil_util.c

@@ -197,6 +197,8 @@ evil_path_is_absolute(const char *path)
    if (!path)
      return 0;
 
+   if (*path == '/' || *path == '\\') return 1;
+
    length = strlen(path);
    if (length < 3) return 0;
 

src/tests/eina/eina_test_file.c

@@ -547,6 +547,11 @@ static const struct {
    const char *test;
    const char *result;
 } sanitize[] = {
+#ifdef _WIN32
+  { "C:\\home\\mydir\\..\\myfile", "C:/home/myfile" },
+  { "C:/home/mydir/../myfile", "C:/home/myfile" },
+  { "\\home\\mydir\\..\\myfile", "/home/myfile" },
+#endif
   { "/home/mydir/../myfile", "/home/myfile" }
 };
 
@@ -558,7 +563,7 @@ EFL_START_TEST(eina_test_file_path)
    for (i = 0; i < sizeof (sanitize) / sizeof (sanitize[0]); i++)
      {
         path = eina_file_path_sanitize(sanitize[i].test);
-        fail_if(strcmp(path, sanitize[i].result));
+        ck_assert_str_eq(path, sanitize[i].result);
         free(path);
      }
 }