[tools] add bc as required by kernels 3.9+
authorwigyori <wigyori@3c298f89-4303-0410-b956-a3cf2f4a3e73>
Mon, 8 Jul 2013 08:45:03 +0000 (08:45 +0000)
committerwigyori <wigyori@3c298f89-4303-0410-b956-a3cf2f4a3e73>
Mon, 8 Jul 2013 08:45:03 +0000 (08:45 +0000)
 - bc is required by the kernel to compute timeconsts files
 - fixes #13767.

Signed-off-by: Zoltan HERPAI <wigyori@uid0.hu>
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@37197 3c298f89-4303-0410-b956-a3cf2f4a3e73


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