Fix amalgamation CI after upstream changes

tools/create-single-header.sh

@@ -5,9 +5,8 @@ amalgamate_tmp_dir=$workingcopy_dir/_amalgamate_tmp
 destination_dir=$workingcopy_dir/single-header
 
 git clone https://github.com/shrpnsld/amalgamate.git --depth 1 $amalgamate_tmp_dir/clone
-cd include/llama
-$amalgamate_tmp_dir/clone/amalgamate -o $amalgamate_tmp_dir -H -v -a -n 'llama'
-cd ../..
+mkdir $amalgamate_tmp_dir
+$amalgamate_tmp_dir/clone/amalgamate -i include/llama -o $amalgamate_tmp_dir -v -a -n 'llama' -x 'hpp,cpp'
 mkdir -p $destination_dir
 mv $amalgamate_tmp_dir/llama-amalgamated/llama.hpp $destination_dir
 rm -rf $amalgamate_tmp_dir