Fix use of LFS-style absolute paths.

Patches from Nixpkgs by Armijn Hemel <armijn@gpl-violations.org>
and Wouter den Breejen <uu@denbreejen.net>.

diff -ruN findutils-4.2.20/locate/updatedb.sh findutils-4.2.20.new/locate/updatedb.sh
--- findutils-4.2.20/locate/updatedb.sh	2005-01-24 17:12:35.000000000 +0100
+++ findutils-4.2.20.new/locate/updatedb.sh	2005-08-23 14:37:10.000000000 +0200
@@ -141,7 +141,7 @@
 : ${code:=${LIBEXECDIR}/@code@}
 
 
-PATH=/bin:/usr/bin:${BINDIR}; export PATH
+PATH=/bin:/usr/bin:${BINDIR}:${PATH}; export PATH
 
 : ${PRUNEFS="nfs NFS proc afs proc smbfs autofs iso9660 ncpfs coda devpts ftpfs devfs mfs sysfs shfs"}
 
diff -Naur findutils-4.2.30/xargs/xargs.c findutils-4.2.30_new/xargs/xargs.c
--- findutils-4.2.30/xargs/xargs.c	2007-02-27 11:21:08.000000000 +0100
+++ findutils-4.2.30_new/xargs/xargs.c	2007-07-17 19:02:05.000000000 +0200
@@ -402,7 +402,7 @@
   int show_limits = 0;			/* --show-limits */
   int always_run_command = 1;
   char *input_file = "-"; /* "-" is stdin */
-  char *default_cmd = "/bin/echo";
+  char *default_cmd = "echo";
   int (*read_args) PARAMS ((void)) = read_line;
   void (*act_on_init_result)(void) = noop;
   int env_too_big = 0;