fix build on arm64 (#162)

Author: isaacbrodsky

src/main/c/h3-java/build-h3.sh

@@ -118,6 +118,7 @@ case "$(uname -sm)" in
     "Linux i686")    LIBRARY_DIR=linux-x86 ;;
     "Linux i786")    LIBRARY_DIR=linux-x86 ;;
     "Linux i886")    LIBRARY_DIR=linux-x86 ;;
+    "Linux aarch64") LIBRARY_DIR=linux-arm64 ;;
     "Darwin x86_64") LIBRARY_DIR=darwin-x64 ;;
     "Darwin arm64")  LIBRARY_DIR=darwin-arm64 ;;
     "FreeBSD amd64") LIBRARY_DIR=freebsd-x64 ;;