Fix typo.

.github/workflows/ccpp.yml

@@ -21,26 +21,3 @@ jobs:
     - name: make
       run: make
 
-name: C/C++ CI
-
-on: [push]
-
-jobs:
-  build-linux:
-    runs-on: ubuntu-20.04
-    steps:
-    - uses: actions/checkout@v1
-    - name: apt
-      run: sudo apt update && sudo apt install bison flex ninja-build
-    - name: make
-      run: make
-
-  build-macos:
-    runs-on: macos-latest
-    steps:
-    - uses: actions/checkout@v2
-    - name: brew
-      run: brew install ninja
-    - name: make
-      run: make
-