Build Bazel on all platforms as part of the presubmit.

This fixes an issue that we can't test downstream projects due to not having the necessary binaries.

PiperOrigin-RevId: 212250184

.bazelci/presubmit.yml

@@ -1,5 +1,11 @@
 ---
 platforms:
+  ubuntu1404:
+    build_targets:
+    - "//src:bazel"
+  ubuntu1604:
+    build_targets:
+    - "//src:bazel"
   ubuntu1804:
     shell_commands:
     - sed -i.bak -e 's/^# android_sdk_repository/android_sdk_repository/' -e 's/^#
@@ -21,6 +27,15 @@ platforms:
     - "-//src/test/shell/bazel/android:android_ndk_integration_test"
     # Re-enable once fixed: https://github.com/bazelbuild/bazel/issues/5888
     - "-//src/test/java/com/google/devtools/build/android/ziputils:ziputils-tests"
+  ubuntu1804_nojava:
+    build_targets:
+    - "//src:bazel"
+  ubuntu1804_java9:
+    build_targets:
+    - "//src:bazel"
+  ubuntu1804_java10:
+    build_targets:
+    - "//src:bazel"
   macos:
     shell_commands:
     - sed -i.bak -e 's/^# android_sdk_repository/android_sdk_repository/' -e 's/^#