package/openjdk: Remove sparc support

package/openjdk: Remove sparc support

Sparc support is deprecated and may be removed in future releases. There are
two choices to fix this issue:

1) Set --enable-deprecated-ports=yes in the CONF_OPTS to supress the error.
2) Remove support for Sparc.

Because this port is deprecated, it's safer to remove support alltogether.

Fixes:
    http://autobuild.buildroot.net/results/692820b4b6d4da42cd557fa7badbbd11806bbeba/

Signed-off-by: Adam Duskett <Aduskett@gmail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>