support Apple M1 build (#86)

Author: tanapoln

CHANGELOG.md

@@ -7,6 +7,8 @@ file [H3Core.java](./src/main/java/com/uber/h3core/H3Core.java), and support
 for the Linux x64 and Darwin x64 platforms.
 
 ## [Unreleased]
+## Fixed
+- Fixes local build script to support Apple M1
 
 ## [3.7.1] - 2021-08-18
 ## Fixed

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

@@ -98,6 +98,7 @@ case "$(uname -sm)" in
     "Linux i786")    LIBRARY_DIR=linux-x86 ;;
     "Linux i886")    LIBRARY_DIR=linux-x86 ;;
     "Darwin x86_64") LIBRARY_DIR=darwin-x64 ;;
+    "Darwin arm64")  LIBRARY_DIR=darwin-arm64 ;;
     "FreeBSD amd64") LIBRARY_DIR=freebsd-x64 ;;
     # TODO: Detect others
     *)               LIBRARY_DIR="" ;;