Consolidate wasi::process and unsupported::process

Author: ehuss

library/std/src/sys/unsupported/fs.rs

@@ -233,10 +233,6 @@ impl File {
     pub fn set_permissions(&self, _perm: FilePermissions) -> io::Result<()> {
         match self.0 {}
     }
-
-    pub fn diverge(&self) -> ! {
-        match self.0 {}
-    }
 }
 
 impl DirBuilder {

library/std/src/sys/unsupported/process.rs

@@ -65,8 +65,8 @@ impl From<AnonPipe> for Stdio {
 }
 
 impl From<File> for Stdio {
-    fn from(file: File) -> Stdio {
-        file.diverge()
+    fn from(_file: File) -> Stdio {
+        panic!("unsupported")
     }
 }
 

library/std/src/sys/wasi/mod.rs

@@ -38,6 +38,7 @@ pub mod ext;
 pub mod path;
 #[path = "../unsupported/pipe.rs"]
 pub mod pipe;
+#[path = "../unsupported/process.rs"]
 pub mod process;
 #[path = "../unsupported/rwlock.rs"]
 pub mod rwlock;