Fix invocation of enable-dylib in CI.

Author: paciorek

.github/workflows/ci.yaml

@@ -89,7 +89,7 @@ jobs:
         if: runner.os != 'Windows'
         run: |
           R CMD build packages/nimble  # Is this needed? Is purpose of this to see if 'build' induces an error?
-          R CMD INSTALL --install-tests --enable-dylib=false packages/nimble  # use libnimble.a to reduce seg faults when using clearCompiled for long sets of AD tests
+          R CMD INSTALL --install-tests --configure-args='--enable-dylib=false' packages/nimble  # use libnimble.a to reduce seg faults when using clearCompiled for long sets of AD tests
 
       - name: Install reverse dependencies
         run: |