win/startup: remove --literal

Fixes 2 failing tests in startup_spec.lua.

The Windows-only `--literal` option complicates support of "stdin-as-text
+ file-args" (#7679).  Could work around it, but it's not worth
the trouble:
- users have a reasonable (and englightening) alternative: nvim +"n *"
- "always literal" is more consistent/predictable
- avoids platform-specific special-case

Unrelated changes:
- Replace fileno(stdxx) with STDXX_FILENO for consistency (not motivated
  by any observed technical reason).

1 files changed, 1 insertions, 1 deletions

diff --git a/src/nvim/os/input.c b/src/nvim/os/input.c
index c999396a6a..dd44df2c3c 100644
--- a/src/nvim/os/input.c
+++ b/src/nvim/os/input.c
@@ -50,7 +50,7 @@ void input_init(void)
   input_buffer = rbuffer_new(INPUT_BUFFER_SIZE + MAX_KEY_CODE_LEN);
 }
 
-/// File (set at startup) used to read user-input (or commands for -e/-es).
+/// This is the global stream of user-input (or Ex-commands for "-es").
 int input_global_fd(void)
 {
   return global_fd;