fix issue with cfg

Author: maminrayej

src/wasi/mod.rs

@@ -31,6 +31,8 @@ pub type time_t = c_longlong;
 pub type c_double = f64;
 pub type c_float = f32;
 pub type ino_t = u64;
+#[cfg(not(target_vendor = "wasmer"))]
+pub type sigset_t = c_uchar;
 pub type suseconds_t = c_longlong;
 pub type mode_t = u32;
 pub type dev_t = u64;
@@ -886,12 +888,8 @@ cfg_if! {
     if #[cfg(target_env = "p2")] {
         mod p2;
         pub use self::p2::*;
-    }
-
-    if #[cfg(target_vendor = "wasmer")] {
+    } else if #[cfg(target_vendor = "wasmer")] {
         mod wasix;
         pub use self::wasix::*;
-    } else {
-        pub type sigset_t = c_uchar;
     }
 }