remove feat_os_unix_musl

After the addition of utmpx, feat_os_unix_musl is now identical to feat_os_unix and is thus not needed any more.

Signed-off-by: Etienne Cordonnier <ecordonnier@snap.com>

Author: Ecordonnier

.github/workflows/CICD.yml

@@ -516,13 +516,13 @@ jobs:
           # - { os , target , cargo-options , features , use-cross , toolchain, skip-tests, workspace-tests }
           - { os: ubuntu-latest  , target: arm-unknown-linux-gnueabihf , features: feat_os_unix_gnueabihf , use-cross: use-cross , skip-tests: true }
           - { os: ubuntu-24.04-arm  , target: aarch64-unknown-linux-gnu   , features: feat_os_unix_gnueabihf }
-          - { os: ubuntu-latest  , target: aarch64-unknown-linux-musl  , features: feat_os_unix_musl      , use-cross: use-cross , skip-tests: true }
+          - { os: ubuntu-latest  , target: aarch64-unknown-linux-musl  , features: feat_os_unix      , use-cross: use-cross , skip-tests: true }
           # - { os: ubuntu-latest  , target: x86_64-unknown-linux-gnu    , features: feat_selinux           , use-cross: use-cross }
           - { os: ubuntu-latest  , target: i686-unknown-linux-gnu      , features: "feat_os_unix,test_risky_names", use-cross: use-cross }
-          - { os: ubuntu-latest  , target: i686-unknown-linux-musl     , features: feat_os_unix_musl      , use-cross: use-cross }
+          - { os: ubuntu-latest  , target: i686-unknown-linux-musl     , features: feat_os_unix      , use-cross: use-cross }
           - { os: ubuntu-latest  , target: x86_64-unknown-linux-gnu    , features: "feat_os_unix,test_risky_names", use-cross: use-cross }
           - { os: ubuntu-latest  , target: x86_64-unknown-linux-gnu    , features: "feat_os_unix,uudoc"   , use-cross: no, workspace-tests: true }
-          - { os: ubuntu-latest  , target: x86_64-unknown-linux-musl   , features: feat_os_unix_musl      , use-cross: use-cross }
+          - { os: ubuntu-latest  , target: x86_64-unknown-linux-musl   , features: feat_os_unix      , use-cross: use-cross }
           - { os: ubuntu-latest  , target: x86_64-unknown-redox        , features: feat_os_unix_redox     , use-cross: redoxer , skip-tests: true }
           - { os: macos-latest   , target: aarch64-apple-darwin        , features: feat_os_macos, workspace-tests: true } # M1 CPU
           - { os: macos-13       , target: x86_64-apple-darwin         , features: feat_os_macos, workspace-tests: true }

Cargo.toml

@@ -148,7 +148,8 @@ feat_os_macos = [
   #
   "feat_require_unix_hostid",
 ]
-# "feat_os_unix" == set of utilities which can be built/run on modern/usual *nix platforms
+# "feat_os_unix" == set of utilities which can be built/run on modern/usual *nix platforms.
+# Also used for targets binding to the "musl" library (ref: <https://musl.libc.org/about.html>)
 feat_os_unix = [
   "feat_Tier1",
   #
@@ -170,15 +171,6 @@ feat_os_unix_gnueabihf = [
   "feat_require_unix_hostid",
   "feat_require_unix_utmpx",
 ]
-# "feat_os_unix_musl" == set of utilities which can be built/run on targets binding to the "musl" library (ref: <https://musl.libc.org/about.html>)
-feat_os_unix_musl = [
-  "feat_Tier1",
-  #
-  "feat_require_crate_cpp",
-  "feat_require_unix",
-  "feat_require_unix_hostid",
-  "feat_require_unix_utmpx",
-]
 feat_os_unix_android = [
   "feat_Tier1",
   #