Add -static-libstdc++ on LINKFLAGS of aarch64

[iwasakims]

I would like -static-libstdc++ on LINKFLAGS for aarch64 to fix BIGTOP-3397 (packaging failure of Spark on CentOS 7(aarch64)).

[iwasakims]

I don't understand how the release artifacts are built yet. make linux-aarch64 did not work on my env. Let me know if I need additional fix.

make test passed on my env (CentOS 7(aarch64)) with the fix.

[info] Test run finished: 0 failed, 0 ignored, 8 total, 0.296s
[info] ScalaTest
[info] Run completed in 25 seconds, 125 milliseconds.
[info] Total number of tests run: 1
[info] Suites: completed 1, aborted 0
[info] Tests: succeeded 1, failed 0, canceled 0, ignored 0, pending 0
[info] All tests passed.
[info] Passed: Total 126, Failed 0, Errors 0, Passed 125, Skipped 1
[success] Total time: 55 s, completed Sep 8, 2020 8:14:28 AM

[xerial]

Hi, nice to see you again @iwasakims san!
Embedding libstdc++ is already enabled for Intel architectures, so adding this for arm should be ok. Let me merge it.

For building snappy-java, basically running make native or make native-all is sufficient. You will need a docker installed on your machine. I haven't tried this command on arm machine, so I guess you need to use Intel machines for running these commands because they use x64 linux images.

[iwasakims]

Thanks, @xerial -san.

[iwasakims]

@xerial san, do you have a plan to release 1.1.7.8 shortly? We will appreciate if the released one rather than SNAPSHOT is available for the next release of Bigtop we are preparing for now.

[xerial]

@iwasakims A blocker is #257. Docker based build (using cross compilers provided by dockcross) suddenly stopped working so I can't build a new version right now.