Comment 1 for bug 1213412

Enhance the clean/distclean targets to remove some additional *.o and *.*.o.cmd files.

The install/uninstall targets seem to work fine:

# make -C linux install
make: Entering directory 'xxxxxxx/rohc.git/linux'
/usr/bin/install -c -d //lib/modules/`uname -r`/extra
/usr/bin/install -c -m 644 ./kmod/rohc.ko //lib/modules/`uname -r`/extra/rohc.ko
/usr/bin/install -c -m 644 ./kmod/rohc_test.ko //lib/modules/`uname -r`/extra/rohc_test.ko
/sbin/depmod -a
make: Leaving directory 'xxxxxxx/rohc.git/linux'

# modinfo /lib/modules/yyyyyyy/extra/rohc.ko
filename: /lib/modules/yyyyyyy/extra/rohc.ko
description: ROHC library, version 2.0.0 (http://rohc-lib.org/)
author: Didier Barvaux, Mikhail Gruzdev, Thales Communications, Viveris Technologies
license: GPL
version: 2.0.0
srcversion: 644B5FCBCB271FB03C0EA44
depends:
vermagic: yyyyyyy SMP preempt mod_unload modversions

# modinfo /lib/modules/yyyyyyy/extra/rohc_test.ko
filename: /lib/modules/yyyyyyy/extra/rohc_test.ko
description: Module for testing ROHC library 2.0.0 (http://rohc-lib.org/)
author: Didier Barvaux, Thales Communications, Viveris Technologies
license: GPL
version: 0.0.1
srcversion: B5CA5E6645BF6EE864CC647
depends: rohc
vermagic: yyyyyyy SMP preempt mod_unload modversions

# make -C linux uninstall
make: Entering directory 'xxxxxxx/rohc.git/linux'
rm -f //lib/modules/`uname -r`/extra/rohc.ko
rm -f //lib/modules/`uname -r`/extra/rohc_test.ko
/sbin/depmod -a
make: Leaving directory 'xxxxxxx/rohc.git/linux'

# ls -l /lib/modules/yyyyyyy/extra/
total 0