Revert "WIP: github: Don't run check-unwind and check-cxxabi on ARM"

This reverts commit ee02cc649bbbdfb9b5f71a1c9b3a30e95ef6ff90.

Author: mstorsjo

.github/workflows/build.yml

@@ -434,7 +434,7 @@ jobs:
             -DCMAKE_INSTALL_MESSAGE=NEVER `
             -DLLVM_LIT_ARGS="-v --time-tests"
           ninja
-          ninja ${{startsWith(matrix.arch, 'a') && 'check-cxx' || 'check-cxx check-cxxabi check-unwind'}}
+          ninja check-cxx check-cxxabi check-unwind
 
   # Run the OpenMP tests with the cross-built toolchains from above.
   # This also forces testing the bundled python executables.

.github/workflows/test-libcxx.yml

@@ -102,4 +102,4 @@ jobs:
             -DCMAKE_INSTALL_MESSAGE=NEVER `
             -DLLVM_LIT_ARGS="-v --time-tests"
           ninja
-          ninja ${{startsWith(matrix.arch, 'a') && 'check-cxx' || 'check-cxx check-cxxabi check-unwind'}}
+          ninja check-cxx check-cxxabi check-unwind