Merge pull request #1598 from sylvestre/nproc

cleanup(nproc): remove some artifacts from the clap migration

src/uu/nproc/Cargo.toml

@@ -15,7 +15,6 @@ edition = "2018"
 path = "src/nproc.rs"
 
 [dependencies]
-getopts = "0.2.18"
 libc = "0.2.42"
 num_cpus = "1.10"
 clap = "2.33"

src/uu/nproc/src/nproc.rs

@@ -8,7 +8,6 @@
 // spell-checker:ignore (ToDO) NPROCESSORS nprocs numstr threadstr sysconf
 
 extern crate clap;
-extern crate getopts;
 extern crate num_cpus;
 
 #[cfg(unix)]
@@ -48,13 +47,13 @@ pub fn uumain(args: impl uucore::Args) -> i32 {
         .arg(
             Arg::with_name(OPT_ALL)
                 .short("")
-                .long("all")
+                .long(OPT_ALL)
                 .help("print the number of cores available to the system"),
         )
         .arg(
             Arg::with_name(OPT_IGNORE)
                 .short("")
-                .long("ignore")
+                .long(OPT_IGNORE)
                 .takes_value(true)
                 .help("ignore up to N cores"),
         )