Moved the generation of the release metadata entry for the MD5 zip outside of the parallel section, so it can't co-incide with the zipping of the binaries. Ensured that any errors generated when merging log files are not just hidden by putting them in the output file (which will render it not well-formed XML).

#!perl -w
use strict;
# Sorts the input, removes duplicates, and outputs it

# Read it
my @content = <>;

# Sort it, and grep to remove duplicates
my $previous = "\n\n";
@content = grep {$_ ne $previous && ($previous = $_, 1) } sort @content;

# Write it
print @content;