Bug#96189: i2c build looks (mistakenly) in /usr/src/linux

["Mark W. Eichin" <eichin@thok.org>]

Package: i2c-source
Version: 2.5.4-3

debian/rules clean has:
	-$(MAKE) clean
This should be
	-$(MAKE) LINUX=$(KSRC) clean 
so as to match the build-modules rule (and other $(MAKE) uses), and
avoid this minor messiness:

dpkg-deb: building package `i2c-2.4.4' in `/usr/src/kernel-source-2.4.4/../i2c-2.4.4_2.5.4-3+toughbook.1.0_i386.deb'.
dh_testdir
dh_testroot
make clean
grep: /usr/src/linux/Makefile: No such file or directory
grep: /usr/src/linux/include/linux/autoconf.h: No such file or directory
grep: /usr/src/linux/.config: No such file or directory
grep: /usr/src/linux/.config: No such file or directory
grep: /usr/src/linux/.config: No such file or directory
grep: /usr/src/linux/.config: No such file or directory
grep: /usr/src/linux/.config: No such file or directory
grep: /usr/src/linux/.config: No such file or directory
grep: /usr/src/linux/.config: No such file or directory
grep: /usr/src/linux/.config: No such file or directory
make[2]: Entering directory `/usr/src/modules/i2c'