Bump more ad-hoc versions.

Author: sunfishcode

crates/wasi-common/Cargo.toml

@@ -12,9 +12,9 @@ edition = "2018"
 include = ["src/**/*", "LICENSE", "WASI/phases"]
 
 # This doesn't actually link to a native library, but it allows us to set env
-# vars like `DEP_WASI_COMMON_14_*` for crates that have build scripts and depend
+# vars like `DEP_WASI_COMMON_15_*` for crates that have build scripts and depend
 # on this crate, allowing other crates to use the same witx files.
-links = "wasi-common-14"
+links = "wasi-common-15"
 
 [dependencies]
 anyhow = "1.0"