cut loadable outputs extra newlines

[Geir Hauge]

Configuration Information [Automatically generated, do not change]:
Machine: x86_64
OS: darwin20.6.0
Compiler: gcc
Compilation CFLAGS: -g -O2
uname output: Darwin macspear 20.6.0 Darwin Kernel Version 20.6.0: Tue Apr 19 2$
Machine Type: x86_64-apple-darwin20.6.0

Bash Version: 5.2
Patch Level: 0
Release Status: rc3

Description:
    examples/loadables/cut.c uses zgetline, which includes the newline
    delimiter in the line it reads, but the rest of the code expects the
    line to not contain the newline.

Repeat-By:
    $ ./bash -c 'enable -f examples/loadables/cut cut ; cut -c4-' <<< 
$'abcdef\nghijkl'
    def
    
    jkl
    
    $

Fix:
    Strip off the newline right after reading the line.  Attached patch
    fixes the problem.

cut-fix.patch
Description: Text document