Resolve multilib conflict in 'libusb-config' script by removing $libdir variable entirely.

http://fedoraproject.org/wiki/PackagingDrafts/MultilibTricks#Multiarch.2C_binaries_and_compilation_scripts

Author: Jan Vcelak <jvcelak@redhat.com>
Date: 2011-06-22

diff -uNPrp libusb-compat-0.1.3/libusb-config.in libusb-compat-0.1.3.multilib/libusb-config.in
--- libusb-compat-0.1.3/libusb-config.in	2009-06-23 23:45:33.000000000 +0200
+++ libusb-compat-0.1.3.multilib/libusb-config.in	2011-06-22 09:55:59.810188470 +0200
@@ -3,7 +3,6 @@
 prefix=@prefix@
 exec_prefix=@exec_prefix@
 includedir=@includedir@
-libdir=@libdir@
 exec_prefix_set=no
 
 usage()
@@ -77,5 +76,5 @@ if test "$echo_cflags" = "yes"; then
 	echo $includes
 fi
 if test "$echo_libs" = "yes"; then
-	echo -L$libdir -lusb
+	echo -lusb
 fi