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/COPYING

@@ -133,7 +133,7 @@ such a program is covered only if its contents constitute a work based
 on the Library (independent of the use of the Library in a tool for
 writing it).  Whether that is true depends on what the Library does
 and what the program that uses the Library does.
-  
+
   1. You may copy and distribute verbatim copies of the Library's
 complete source code as you receive it, in any medium, provided that
 you conspicuously and appropriately publish on each copy an

wrlib/ChangeLog

@@ -2,7 +2,7 @@
 - removed Hermes code.
 - Put back asm/mmx optimized code.
 
-- fixed a bug in RCombineAreaWithOpaqueness() (Brad <lists@anomie.yi.org>)       
+- fixed a bug in RCombineAreaWithOpaqueness() (Brad <lists@anomie.yi.org>)
 
 - Added retain/release mechanism to RImage by adding RRetainImage() and
   RReleaseImage(). RDestroyImage() is an alias to RReleaseImage() now, but
@@ -24,7 +24,7 @@
 - fixed code dependant on the order of evaluation. code like
   *ptr++ = *ptr++ = *ptr++ = color;
   is wrong, because there is no guarantee that ptr will be incremented
-  _between_ the assignment operations. it can be incremented after all 
+  _between_ the assignment operations. it can be incremented after all
   assignment operations as well. Because of this both of these are valid
   implementations for a compiler:
    a. assign, increment, assign, increment, assign, increment
@@ -33,7 +33,7 @@
   assigned 3 times the same value, while the other 2 remain unchanged.
   For example egcs-2.91.66 (and possibly gcc-2.95.x too) implement this in
   the second way (like in case b.)
-  Also the order in which the assignement is made is undefined (left to right 
+  Also the order in which the assignement is made is undefined (left to right
   or right to left).
 
 - added RMakeCenteredImage()

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.

wrlib/tests/Makefile.am

@@ -4,7 +4,7 @@ AUTOMAKE_OPTIONS =
 
 noinst_PROGRAMS = testdraw testgrad testrot view
 
-EXTRA_DIST = test.png tile.xpm ballot_box.xpm 
+EXTRA_DIST = test.png tile.xpm ballot_box.xpm
 
 AM_CPPFLAGS = -I$(srcdir)/.. $(DFLAGS) @HEADER_SEARCH_PATH@