style(hook): clippy -D warnings clean on default + fifa17 features

Modernize manual nul-terminated byte strings to C-string literals (c"...")
at all Win32 GetModuleHandleA/GetProcAddress/getaddrinfo call sites (byte-identical),
drop two redundant SOL_SOCKET-as-i32 casts, remove a needless return in the fifa17
install path, and add a # Safety section to DllMain. Scope the FIFA-23-path
dead-code/unused-import lints (unused only under the fifa17 feature, stripped by the
linker) with a documented crate-level cfg_attr allow. Cross-verified: both the
default and fifa17 builds now pass clippy -D warnings and compile; probe and
capture_baseline still build.

openfut-hook/src/transport_watch.rs

@@ -152,7 +152,7 @@ pub unsafe fn note_connect(api: &str, name: *const u8, namelen: i32, s: usize) {
         let mut len: i32 = 4;
         getsockopt(
             s,
-            SOL_SOCKET as i32,
+            SOL_SOCKET,
             SO_TYPE,
             &mut ty as *mut i32 as *mut u8,
             &mut len,