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

wrlib/README

@@ -6,7 +6,7 @@ a format that can be displayed through the X window system.
 Read the wraster.h header for an idea of what is available
 
 
-This Library is LGPL and 
+This Library is LGPL and
 Copyright (c) Alfredo K. Kojima <kojima@inf.ufrgs.br>
 
 
@@ -27,7 +27,7 @@ Default is 4k (64x64)
 Porting
 =======
 
-It should be fairly easy to port it to other environments 
+It should be fairly easy to port it to other environments
 (svgalib, libggi etc), probably only requiring wraster.h,
 context.c and convert.c to be changed. Note that the X specific
 code should be disabled in that case, including support for libXpm.