Use the downloaded clang when building for armhf-debian

This makes it work on a barebones Stretch installation.

Also add building for this CPU to the CI script so we know it keeps
working, which means marking everything that's supposed to work
appropriately.

Change-Id: Ic050ce20eae45c6b23e0e42dddb24db3ebc70b84
diff --git a/aos/vision/image/BUILD b/aos/vision/image/BUILD
index e41aabc..8409ea5 100644
--- a/aos/vision/image/BUILD
+++ b/aos/vision/image/BUILD
@@ -1,46 +1,66 @@
-package(default_visibility = ['//visibility:public'])
-load('//tools/build_rules:protobuf.bzl', 'proto_cc_library')
+package(default_visibility = ["//visibility:public"])
+
+load("//tools/build_rules:protobuf.bzl", "proto_cc_library")
 
 cc_library(
-  name = 'image_types',
-  hdrs = ['image_types.h'],
-  deps = [
-    '//aos/common/logging:logging',
-  ],
+    name = "image_types",
+    hdrs = ["image_types.h"],
+    compatible_with = [
+        "//tools:armhf-debian",
+    ],
+    deps = [
+        "//aos/common/logging",
+    ],
 )
 
 proto_cc_library(
-  name = 'camera_params',
-  src = 'camera_params.proto',
+    name = "camera_params",
+    src = "camera_params.proto",
+    compatible_with = [
+        "//tools:armhf-debian",
+    ],
 )
 
 cc_library(
-  name = 'reader',
-  srcs = ['reader.cc'],
-  hdrs = ['V4L2.h', 'reader.h'],
-  deps = [
-    '//aos/common:time',
-    '//aos/common/logging:logging',
-    ':image_types',
-    ':camera_params',
-  ],
+    name = "reader",
+    srcs = ["reader.cc"],
+    hdrs = [
+        "V4L2.h",
+        "reader.h",
+    ],
+    compatible_with = [
+        "//tools:armhf-debian",
+    ],
+    deps = [
+        ":camera_params",
+        ":image_types",
+        "//aos/common:time",
+        "//aos/common/logging",
+    ],
 )
 
 cc_library(
-  name = 'jpeg_routines',
-  srcs = ['jpeg_routines.cc'],
-  hdrs = ['jpeg_routines.h'],
-  deps = [
-    '//third_party/libjpeg',
-    '//aos/common/logging:logging',
-    ':image_types'
-  ],
+    name = "jpeg_routines",
+    srcs = ["jpeg_routines.cc"],
+    hdrs = ["jpeg_routines.h"],
+    compatible_with = [
+        "//tools:armhf-debian",
+    ],
+    deps = [
+        ":image_types",
+        "//aos/common/logging",
+        "//third_party/libjpeg",
+    ],
 )
 
-cc_library(name = 'image_stream',
-  hdrs = ['image_stream.h'],
-  deps = [
-    '//aos/vision/events:epoll_events',
-    '//aos/vision/image:reader'
-  ]
+cc_library(
+    name = "image_stream",
+    hdrs = ["image_stream.h"],
+    compatible_with = [
+        "//tools:armhf-debian",
+    ],
+    deps = [
+        "//aos/vision/events:epoll_events",
+        "//aos/vision/image:reader",
+    ],
 )