Auto merge of rust-lang#34783 - Dridi:cdylib_usage, r=alexcrichton

Mention the crate type cdylib in rustc's usage

Hello,

I just tried to build a `cdylib` with the latest stable release, I've been passively waiting for this for quite some time now. Tested successfully on my machine, although it doesn't appear in `rustc`'s usage it seems to work like a charm so far. 😀

Thanks!

Author: bors

man/rustc.1

@@ -44,7 +44,7 @@ The optional \fIKIND\fR can be one of \fIstatic\fR, \fIdylib\fR, or
 \fIframework\fR.
 If omitted, \fIdylib\fR is assumed.
 .TP
-\fB\-\-crate\-type\fR [bin|lib|rlib|dylib|staticlib]
+\fB\-\-crate\-type\fR [bin|lib|rlib|dylib|cdylib|staticlib]
 Comma separated list of types of crates for the compiler to emit.
 .TP
 \fB\-\-crate\-name\fR \fINAME\fR

src/librustc/session/config.rs

@@ -981,7 +981,7 @@ pub fn rustc_short_optgroups() -> Vec<RustcOptGroup> {
                              assumed.", "[KIND=]NAME"),
         opt::multi_s("", "crate-type", "Comma separated list of types of crates
                                     for the compiler to emit",
-                   "[bin|lib|rlib|dylib|staticlib]"),
+                   "[bin|lib|rlib|dylib|cdylib|staticlib]"),
         opt::opt_s("", "crate-name", "Specify the name of the crate being built",
                "NAME"),
         opt::multi_s("", "emit", "Comma separated list of types of output for \