Add the accidentally deleted function

src/safeposix/filesystem.rs

@@ -7,6 +7,11 @@ use crate::interface;
 
 use super::cage::Cage;
 
+pub fn convpath(cpath: &str) ->
+    interface:: RustPathBuf {
+    interface::RustPathBuf:: from(cpath)
+}
+
 pub fn normpath(origp: interface::RustPathBuf, cage: &Cage) -> interface::RustPathBuf {
     //If path is relative, prefix it with the current working directory, otherwise populate it with rootdir
     let mut newp = if origp.is_relative() {