Use protoc x86_64 on Apple M1 aarch64

The old protoc version 3.5.1 atlasdb uses does not yet support Apple M1 aarch64
(see protocolbuffers/protobuf#8062), so use x86_64 until
atlasdb upgrades to protoc 3.18.0+ which add osx-aarch_64.

atlasdb-client-protobufs/build.gradle

@@ -2,9 +2,12 @@ apply from: "../gradle/shared.gradle"
 
 apply plugin: 'com.google.protobuf'
 
+// The protoc version atlasdb uses does not yet support Apple M1 aarch64
+// (see https://github.com/protocolbuffers/protobuf/issues/8062), so use x86_64.
+def protocArch = 'osx-aarch_64'.equals(osdetector.classifier) ? 'osx-x86_64' : osdetector.classifier
 protobuf {
   protoc {
-    artifact = "com.google.protobuf:protoc:${libVersions.protoc}"
+    artifact = "com.google.protobuf:protoc:${libVersions.protoc}:${protocArch}"
   }
 }
 

examples/profile-client-protobufs/build.gradle

@@ -4,9 +4,12 @@ group = 'com.palantir.atlasdb.examples'
 
 apply plugin: 'com.google.protobuf'
 
+// The protoc version atlasdb uses does not yet support Apple M1 aarch64
+// (see https://github.com/protocolbuffers/protobuf/issues/8062), so use x86_64.
+def protocArch = 'osx-aarch_64'.equals(osdetector.classifier) ? 'osx-x86_64' : osdetector.classifier
 protobuf {
   protoc {
-    artifact = "com.google.protobuf:protoc:${libVersions.protoc}"
+    artifact = "com.google.protobuf:protoc:${libVersions.protoc}:${protocArch}"
   }
 }
 

leader-election-api-protobufs/build.gradle

@@ -2,9 +2,12 @@ apply from: "../gradle/shared.gradle"
 
 apply plugin: 'com.google.protobuf'
 
+// The protoc version atlasdb uses does not yet support Apple M1 aarch64
+// (see https://github.com/protocolbuffers/protobuf/issues/8062), so use x86_64.
+def protocArch = 'osx-aarch_64'.equals(osdetector.classifier) ? 'osx-x86_64' : osdetector.classifier
 protobuf {
   protoc {
-    artifact = "com.google.protobuf:protoc:${libVersions.protoc}"
+    artifact = "com.google.protobuf:protoc:${libVersions.protoc}:${protocArch}"
   }
 }