Ninja: Match showIncludes dependencies using console output code page

Generalize the fix from commit 37a279f8d1 (Ninja: Write msvc_deps_prefix
as UTF-8 when console codepage is UTF-8, 2020-07-31, v3.19.0-rc1~349^2).
`cl /showIncludes` output is encoded using the console output code page,
so this is the byte sequence that Ninja must use to match its lines.

Fixes: #24068
14 files changed