[MacPorts] #62551: bazel 3.1 fails to install on macOS 10.15

[MacPorts]

#62551: bazel 3.1 fails to install on macOS 10.15
-----------------------+--------------------
 Reporter:  essandess  |      Owner:  (none)
     Type:  defect     |     Status:  new
 Priority:  Normal     |  Milestone:
Component:  ports      |    Version:  2.6.4
 Keywords:             |       Port:  bazel
-----------------------+--------------------
 The port bazel-3.1 fails to build on macOS 10.15, which prevents a build
 of tensorflow and dependent ports.

 Error:
 {{{
 Target //src:bazel_nojdk failed to build
 }}}

 This appears to be a known issue:
 * https://github.com/bazelbuild/bazel/issues/7940#issuecomment-553447868
 * https://github.com/bazelbuild/bazel/issues/6654

 The link above indicates that setting

 {{{EXTRA_BAZEL_ARGS="--host_javabase=@local_jdk//:jdk"}}}

 fixes this issue, and I verify that it does. I'll post a PR fix.

 System info (default java LTS version installed):

 {{{
 macOS 10.15.7 19H524
 Xcode 12.4 12D4e
 }}}

 {{{
 java -version
 openjdk version "11.0.10" 2021-01-19
 OpenJDK Runtime Environment AdoptOpenJDK (build 11.0.10+9)
 OpenJDK 64-Bit Server VM AdoptOpenJDK (build 11.0.10+9, mixed mode)
 }}}

-- 
Ticket URL: <https://trac.macports.org/ticket/62551>
MacPorts <https://www.macports.org/>
Ports system for macOS