Bug#559767: severity of 559767 is important

[Emmanuel Bourg]

Despite the similar error message the build fail for another reason on
amd64. The "libj3dcore-ogl.so: No such file or directory" message occurs
whenever a compilation error occurs in the native part of java3d. The
actual error is higher in the log just before the javadoc generation:

    /usr/include/GL/glxext.h:480:164: error: unknown type name 'GLintptr'

This is caused by a recent change in mesa, see #765933. I don't know if
java3d has to be updated or if a fix has to be applied in mesa only.

The original error on armel was about undefined references to
`__aeabi_*'. Since this is not the same issue I'm going to lower the
severity to 'important' and open a new bug if a change is needed on the
java3d side.