Broken attempt at fixing the libc style linter for `cfg_if`.

bad.cfg_if.diff

diff --git a/src/unix/linux_like/linux/mod.rs b/src/unix/linux_like/linux/mod.rs
index c1705a94e..e3933b4f1 100644
--- a/src/unix/linux_like/linux/mod.rs
+++ b/src/unix/linux_like/linux/mod.rs
@@ -3393,25 +3393,28 @@ extern "C" {
     ) -> ::c_int;
     pub fn fanotify_init(flags: ::c_uint, event_f_flags: ::c_uint) -> ::c_int;
 
-    #[cfg(not(target_env = "musl"))]
-    pub fn fanotify_mark(
-        fd: ::c_int,
-        flags: ::c_uint,
-        mask: u64,
-        dirfd: ::c_int,
-        path: *const ::c_char,
-    ) -> ::c_int;
-    // Musl targets need the `mask` argument of `fanotify_mark` be specified `::c_ulonglong`
-    // instead of `u64` or there will be a type mismatch between `long long unsigned int` and the
-    // expected `uint64_t`.
-    #[cfg(target_env = "musl")]
-    pub fn fanotify_mark(
-        fd: ::c_int,
-        flags: ::c_uint,
-        mask: ::c_ulonglong,
-        dirfd: ::c_int,
-        path: *const ::c_char,
-    ) -> ::c_int;
+    cfg_if! {
+        if #[cfg(not(target_env = "musl"))] {
+            pub fn fanotify_mark(
+                fd: ::c_int,
+                flags: ::c_uint,
+                mask: u64,
+                dirfd: ::c_int,
+                path: *const ::c_char,
+            ) -> ::c_int;
+        } else if #[cfg(target_env = "musl")] {
+            // Musl targets need the `mask` argument of `fanotify_mark` be specified `::c_ulonglong`
+            // instead of `u64` or there will be a type mismatch between `long long unsigned int` and the
+            // expected `uint64_t`.
+            pub fn fanotify_mark(
+                fd: ::c_int,
+                flags: ::c_uint,
+                mask: ::c_ulonglong,
+                dirfd: ::c_int,
+                path: *const ::c_char,
+            ) -> ::c_int;
+        }
+    }
 }
 
 cfg_if! {

bad.cfg_if.diff.compile.err.txt

$> cargo build
   Compiling libc v0.2.68 (/home/daniel/Code/libc)
error: expected one of `!`, `(`, `+`, `::`, `<`, `where`, or `{`, found `;`
    --> src/unix/linux_like/linux/mod.rs:3404:25
     |
3404 |             ) -> ::c_int;
     |                         ^ expected one of 7 possible tokens

error: aborting due to previous error

error: could not compile `libc`.

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