expr: fix ~ update onig/onig_sys dependency (fixes windows compilatio…

…n bug)

* fixes compile bug which blocked compilation on windows unless the MSVC/VS tools were
  prepared and available on the PATH (via `vsvarsall` or the "VCX command prompt")

src/expr/Cargo.toml

@@ -10,7 +10,7 @@ path = "expr.rs"
 
 [dependencies]
 libc = "0.2.42"
-onig = "3.1.1"
+onig = "4.2.1"
 uucore = { path="../uucore" }
 
 [[bin]]