Downgrade required cc version to match rustc

rustc_llvm pins the cc dependency to a specific version as cc changes
frequently cause breakage for rustc. Because psm uses a newer cc version,
it is impossible to update psm and by extension stacker.

Author: bjorn3

Cargo.toml

@@ -43,4 +43,4 @@ features = [
 
 
 [build-dependencies]
-cc = "1.2.33"
+cc = "1.2.16"

psm/Cargo.toml

@@ -15,4 +15,4 @@ readme = "README.mkd"
 
 [build-dependencies]
 ar_archive_writer = "0.5.0"
-cc = "1.2.33"
+cc = "1.2.16"