AWS-LC integration: Temporarily patch importer.sh

The script importing mlkem-native into AWS-LC does not work as expected
on MacOS. While this is the case, patch it up.

This commit will be removed once the importer is fixed in AWS-LC.

Signed-off-by: Hanno Becker <beckphan@amazon.co.uk>

Author: hanno-becker

.github/actions/setup-aws-lc/action.yml

@@ -32,3 +32,9 @@ runs:
 
         # Remember AWS-LC directory
         echo AWSLC_DIR="$GITHUB_WORKSPACE/${{ inputs.dir }}" >> $GITHUB_ENV
+        AWSLC_DIR=$GITHUB_WORKSPACE/${{ inputs.dir }}
+
+        # TEMPORARY: Patch up importer
+        if [[ "$(uname)" == "Darwin" ]]; then
+          sed -i '' 's/\$SED_I/"${SED_I[@]}"/g' $AWSLC_DIR/crypto/fipsmodule/ml_kem/importer.sh
+        fi