Console apps in Windows can raise OSError (#15874)

Console apps in Windows implementation can raise OSError so I've fixed it, see below some examples for reference:
- c07807bedf/lib/pure/terminal.nim (L170)
- c07807bedf/lib/pure/terminal.nim (L178)
- c07807bedf/lib/pure/terminal.nim (L191-L192)
- c07807bedf/lib/pure/terminal.nim (L196-L197)
- ...

(cherry picked from commit 49f68122e6)

lib/pure/terminal.nim

@@ -37,7 +37,10 @@ type
 
 var gTerm {.threadvar.}: owned(PTerminal)
 
-proc newTerminal(): owned(PTerminal) {.gcsafe, raises: [].}
+when defined(windows) and defined(consoleapp):
+  proc newTerminal(): owned(PTerminal) {.gcsafe, raises: [OSError].}
+else:
+  proc newTerminal(): owned(PTerminal) {.gcsafe, raises: [].}
 
 proc getTerminal(): PTerminal {.inline.} =
   if isNil(gTerm):