src.zip is not being updated when running make images

[Jorn Vernee]

Hello,

I'm running into a problem where running `make images` does not update 
the `images/jdk/lib/src.zip` file. I have tried deleting the file and 
then running the command, which creates the src.zip, but it still has 
the old source files in it.

I'm debugging using my IDE (Netbeans), but with the old source files the 
line numbers are incorrect, and it shows me the wrong part of the file.

I can get the right src.zip to generate by first running `make clean`, 
and then running `make images`, but doing a full rebuild takes a long 
time for me (sometimes upwards of an hour), so I was wondering if there 
is a way to trigger the re-generation of src.zip without doing a full 
rebuild? I couldn't find anything about it in the building docs, besides 
gensrc, which seems to be for generating source files?

Thanks,
Jorn