Remove vpath.sed; unused for literally decades AFAICS

* vpath.sed: Remove unused file.
* make-dist: No more vpath.sed.

ChangeLog

+2012-05-21  Glenn Morris  <rgm@gnu.org>
+
+	* vpath.sed: Remove unused file.
+	* make-dist: No more vpath.sed.
+
 2012-05-21  Paul Eggert  <eggert@cs.ucla.edu>
 
 	Use full name for m4/gnulib-comp.m4.  (Bug#11529)

make-dist

@@ -285,7 +285,7 @@ mkdir ${tempdir}
 echo "Making links to top-level files"
 ln INSTALL README BUGS ${tempdir}
 ln ChangeLog Makefile.in configure configure.in ${tempdir}
-ln config.bat make-dist update-subdirs vpath.sed .dir-locals.el ${tempdir}
+ln config.bat make-dist update-subdirs .dir-locals.el ${tempdir}
 ln aclocal.m4 ${tempdir}
 
 echo "Creating subdirectories"

vpath.sed

-/^VPATH *=/c\
-# This works only in GNU make.  Using the patterns avoids\
-# object files being found by VPATH, and thus permits building\
-# when $srcdir is configured itself.\
-vpath %.c $(srcdir)\
-vpath %.h $(srcdir)\
-\
-