Revert "Revert "Unvendor OpenSSL for Windows to avoid CI troubles with perl.exe""

This reverts commit 4f28ed1044.

storage-bigtable/Cargo.toml

@@ -35,8 +35,13 @@ zstd = "0.5.1"
 
 # openssl is a dependency of the goauth and smpl_jwt crates, but explicitly
 # declare it here as well to activate the "vendored" feature that builds OpenSSL
-# statically
+# statically...
+[target."cfg(not(windows))".dependencies]
 openssl = { version = "0.10", features = ["vendored"] }
+# ...except on Windows to avoid having to deal with getting CI past a build-time
+# Perl dependency
+[target."cfg(windows)".dependencies]
+openssl = { version = "0.10", features = [] }
 
 [lib]
 crate-type = ["lib"]