id: add note about conditional compiling to README section

.github/workflows/CICD.yml

@@ -14,7 +14,7 @@ env:
   PROJECT_DESC: "Core universal (cross-platform) utilities"
   PROJECT_AUTH: "uutils"
   RUST_MIN_SRV: "1.51.0" ## MSRV v1.51.0
-  RUST_COV_SRV: "2020-07-01" ## (~v1.47.0) supported rust version for code coverage; (date required/used by 'coverage') ## !maint: refactor when code coverage support is included in the stable channel
+  RUST_COV_SRV: "2020-08-01" ## (~v1.47.0) supported rust version for code coverage; (date required/used by 'coverage') ## !maint: refactor when code coverage support is included in the stable channel
 
 on: [push, pull_request]
 
@@ -275,9 +275,6 @@ jobs:
         case '${{ matrix.job.os }}' in
           macos-latest) brew install coreutils ;; # needed for testing
         esac
-        case '${{ matrix.job.features }}' in
-          feat_selinux) sudo apt-get -y update ; sudo apt-get -y install libselinux1-dev ;; # TODO: is here the right place for this?
-        esac
     - name: Initialize workflow variables
       id: vars
       shell: bash

.github/workflows/GnuTests.yml

@@ -48,14 +48,7 @@ jobs:
     - name: Run GNU tests
       shell: bash
       run: |
-        # bash uutils/util/run-gnu-test.sh # TODO: revert after testing
-          bash uutils/util/run-gnu-test.sh tests/id/context.sh
-          bash uutils/util/run-gnu-test.sh tests/id/no-context.sh
-          bash uutils/util/run-gnu-test.sh tests/id/smack.sh
-          bash uutils/util/run-gnu-test.sh tests/id/uid.sh
-          bash uutils/util/run-gnu-test.sh tests/id/setgid.sh
-          bash uutils/util/run-gnu-test.sh tests/id/zero.sh
-          bash uutils/util/run-gnu-test.sh tests/id/gnu-zero-uids.sh
+        bash uutils/util/run-gnu-test.sh
     - name: Extract testing info
       shell: bash
       run: |