CI: AWS-LC: Specify the library directory lib.

Added the `-DCMAKE_INSTALL_LIBDIR=lib` option to specify the library directory
explicitly. While the CI AWS-LC case creates the "lib" directory without the
option, I observed the `lib64` directory was created on my local environment.
So, this change is useful to provide information to create a local environment.

Author: junaruga

.github/workflows/test.yml

@@ -127,7 +127,7 @@ jobs:
             git clone https://github.com/aws/aws-lc.git .
             AWS_LC_RELEASE=$(git tag --sort=-creatordate --list "v*"  | head -1)
             git checkout $AWS_LC_RELEASE
-            cmake -DCMAKE_INSTALL_PREFIX=$HOME/openssl
+            cmake -DCMAKE_INSTALL_PREFIX=$HOME/openssl -DCMAKE_INSTALL_LIBDIR=lib
             make -j4 && make install
             ;;
           *)