RFR: JDK-8171500: Explicitly set --with-target-bits=64 in 64bit jib profiles

[Erik Joelsson]

Hello,

If a user asks Jib to build a profile that is supposed to be 64bit, we 
want configure to fail early if it cannot be done. Currently, if 
configure thinks the build platform only supports 32bit builds, it will 
just default to 32bit. By explicitly setting --with-target-bits=64, we 
instead get a failure. This patch adds the argument to all relevant Jib 
profile configurations.

Bug: https://bugs.openjdk.java.net/browse/JDK-8171500

Webrev: http://cr.openjdk.java.net/~erikj/8171500/webrev.01/

/Erik