ci: enable lto for visionOS

requires llvm 18+

.github/workflows/build.yml

@@ -11,7 +11,7 @@ env:
 #  GITHUB_ENV: https://docs.github.com/en/actions/learn-github-actions/environment-variables#about-environment-variables
   FF_VERSION: ${{ vars.FF_VER }} # TODO: latest release if triggered by schedule
   LLVM_VER: ${{ vars.LLVM_VER }}
-  LLVM_VER_DEFAULT: 19
+  LLVM_VER_DEFAULT: 20
   NINJA_STATUS: '[%f/%t %e %r]'
   SF_PW_MAPPED: ${{ secrets.SF_PW }}
   SF_USER_MAPPED: ${{ secrets.SF_USER }}
@@ -48,11 +48,11 @@ jobs:
             target: tvOSSimulator
           - config: default
             target: visionOS
-          - config: lite-lto # llvm-ar-17 merged visionOS lto libs has wrong contents (/,//,*.o/)
+          - config: lite # llvm-ar-17 merged visionOS lto libs has wrong contents (/,//,*.o/)
             target: visionOS
           - config: default
             target: visionOSSimulator
-          - config: lite-lto
+          - config: lite
             target: visionOSSimulator
     steps:
     - uses: actions/checkout@v4