PATCH: _java to arg completion for class arguments

[Felix Rosencrantz <f_rosencrantz@yahoo.com>]

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This is a small patch that adds 2 features to the _java completer.
1. For the java command, this adds a call to _normal after specifying the class
to run for java.  This makes it possible to write completion functions for java
classes.  This was inspired by Bart's change in zsh-workers/13599 for _sh.

2. For the jar command, if the user specifies the -x flag to extract files, the
completion function now allows the user to complete files file the jar.

-FR.

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Index: _java
===================================================================
RCS file: /cvsroot/zsh/zsh/Completion/Unix/Command/_java,v
retrieving revision 1.1
diff -r1.1 _java
4c4
< local curcontext="$curcontext" state line
---
> local curcontext="$curcontext" state line jf
48c48,49
<     '*:arguments:_default' && return 0
---
>     '*::args: _normal' \
>      && return 0
528a530,537
>   elif [[ $words[2] = *x* ]]; then
>         jf="$words[3]"
>         if [[ $jf != $_jar_cache_name && -f $jf ]]; then
>             _jar_cache_list=("${(@f)$($words[1] tf $jf)}")
>             _jar_cache_name=$jf
>         fi
> 
>         _wanted files expl 'file from archive' _multi_parts / _jar_cache_list