Deal with ABI requirements for function names

[Dushistov]

I like restriction of 100 characters maximum for line length,
and I want force this restriction to my code, but I cann't.

My function should have such name Java_net_akaame_project_packet_LibraryService_subscribeOnUpdates__Lnet_akaame_project_packet_InfoLoggerAsync_2

this is external restriction I can not change. This is part is restriction of ABI of Oracle's Java virtual machine,
I have java code like this:

package net.akaame.project.packet;

class LibraryService {
public native void subscribeOnUpdates(InfoLoggerAsync obj);
}

and to have ability connect my rust and java code I have name function in such way.

But it's length exceed 100 characters maximum. So --write-mode diff return error,

so it would be nice add ability to force 100 characters maximum, except pub, #[no_mangle] function names.

I suppose my use case not unique, for example in plugin development,
you may also have similar requirment for function names.