fixup CC 2

Author: vszakats

.github/workflows/build.yml

@@ -50,9 +50,9 @@ jobs:
 
       - name: 'make'
         env:
-          CC: '${{ matrix.build.CC || 'cc' }}'
-          CFLAGS: '${{ matrix.build.CFLAGS }}'
-          LDFLAGS: '${{ matrix.build.LDFLAGS }}'
+          CC: ${{ matrix.build.CC || 'cc' }}
+          CFLAGS: ${{ matrix.build.CFLAGS }}
+          LDFLAGS: ${{ matrix.build.LDFLAGS }}
         run: make
 
       - name: 'sanity test'