Deprecate Oracle 8 on ARM

[jogger]

The current deprecation warnings are outdated. They refer to a situation lang ago on ARM32 (not ARM64) when there was a choice only between the unusable OpenJDK 8 and Oracle Java 8.

Now OpenJDK 9-11 come standard with distros like Debian Stretch. Those should be recommended.

My arguments against Oracle Java 8 on ARM 32:

• Throws SIGILL and SIGSEV every couple of days with busy i2p
• Much slower in my testing against OpenJDK 9.0.4 (built on machine) using Scimark2 and SpeedTest1
• Built from closed source using unknown options and linked to unknown libraries
• Cross-compiled using outdated beta tools (try objdump)

[zzz]

This warning is in RouterConsoleRunner?. There's a related recommendation at the top of ​http://i2p-projekt.i2p/en/download

[zzz]

In e35375d2a98b142db1e7a56766e3237996244edf 0.9.38-11.
Based on your first two arguments. Last two are not relevant.
Leaving open to update the download page.

[slumlord]

Updated the download text for Raspberry Pi to say "OpenJDK 9 for ARM" & link to point to ​https://openjdk.java.net/install/ -- changes in 1760d1080c5cb80fe4b7090f6618b5748244bbdb

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FreeBSD does not yet have OpenJDK version higher than 8.
Based upon this: ​https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=222568 - FreeBSD may go directly to the next long term release of OpenJDK which is version 11