Update to cfg-if 1.0.0

Author: benesch

Cargo.toml

@@ -19,7 +19,7 @@ doctest = false
 test = false
 
 [dependencies]
-cfg-if = "0.1.6"
+cfg-if = "1.0.0"
 libc = "0.2.45"
 psm = { path = "psm", version = "0.1.7" }