[Buildroot] make clean (uninstall) problem with ccache-2.4

[Olof Backing]

Hi!
I realise that I since some time have been locally fixing an makefile  
error in ccache-2.4:

make -j3 -C /home/olof/gumstix-buildroot/toolchain_build_arm_nofpu/ 
ccache-2.4 uninstall
make[1]: Entering directory `/home/olof/gumstix-buildroot/ 
toolchain_build_arm_nofpu/ccache-2.4'
make[1]: *** No rule to make target `uninstall'.  Stop.
make[1]: Leaving directory `/home/olof/gumstix-buildroot/ 
toolchain_build_arm_nofpu/ccache-2.4'
make: *** [ccache-clean] Error 2

The ccache.mk file is trying to "uninstall" but the makefile in  
toolchain doesn't like that. A lot of other packges have the  
"uninstall" thing commented out.

/Olof
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