force unlink of lock file

Author: TimToady

build.pl

@@ -15,4 +15,5 @@
 die "Found no rebuild script for $what\n" unless $script;
 
 system "flock -w 60 $script_dir/lock.$what $script @ARGV >~/log/$what.log 2>&1";
+unlink "$script_dir/lock.$what";
 #system $^X, "$FindBin::Bin/sync.pl",  $what;