Remove trailing whitespace.

Also, the script is a one-liner, stolen from [1]:

ack --print0 -l '[ \t]+$' | xargs -0 -n1 perl -pi -e 's/[ \t]+$//'

[1]
https://stackoverflow.com/questions/149057/how-to-remove-trailing-whitespace-of-all-files-recursively

distros/wmaker-crm-next.spec

@@ -503,7 +503,7 @@ rm -rf $RPM_BUILD_ROOT
 
 * Tue Aug 09 2005 Andreas Bierfert <andreas.bierfert[AT]lowlatency.de>
 0.92.0-1
-- upgrade to new version 
+- upgrade to new version
 - use dist tag
 - use smp_mflags
 - fix #163459