Various: whitespace cleanups

All trailing whitespace (either at EOL or as entire last line) was
removed except in slack-desc files where all of them were made to
leave a trailing space after the 'blank' colons.

This only affects the builds that I maintain.

Signed-off-by: Robby Workman <rworkman@slackbuilds.org>

desktop/root-tail/README

@@ -11,9 +11,9 @@ root-tail -g 800x250+100+50 -font 10x20 /var/log/messages,green \
   -font 12x24 /var/log/secure,red,'ALERT'
 
 By default root-tail doesn't seem to work on XFCE. You need to explicitly
-specify the ID of the display to use it (by using the "-id" flag of root-tail).
-Use the xprop command to find the active root display, and run this through
-the cut command to strip out the ID number for insertion into the 
+specify the ID of the display to use it (by using the "-id" flag of
+root-tail). Use the xprop command to find the active root display, and run
+this through the cut command to strip out the ID number for insertion into the
 root-tail `-id` field.
 
 It looks a little something like this:

misc/gcolor2/doinst.sh

@@ -1,4 +1,3 @@
 if [ -x usr/bin/update-desktop-database ]; then
     usr/bin/update-desktop-database -q usr/share/applications
 fi
-

misc/gxmessage/doinst.sh

@@ -3,4 +3,3 @@ if [ -e usr/share/icons/hicolor/icon-theme.cache ]; then
     /usr/bin/gtk-update-icon-cache usr/share/icons/hicolor >/dev/null 2>&1
   fi
 fi
-

system/rox-filer/doinst.sh

@@ -36,4 +36,3 @@ config etc/rox/xdg/rox.sourceforge.net/MIME-types/text.new
 config etc/rox/xdg/rox.sourceforge.net/MIME-types/text_html.new
 config etc/profile.d/rox-filer.sh.new
 config etc/profile.d/rox-filer.csh.new
-