Improved biglib* targets. The topmost Makefile now includes the kaldi.mk so the configuration can be only in the kaldi.mk
Fixed biglibext library name in -Wl,-soname


git-svn-id: https://svn.code.sf.net/p/kaldi/code/sandbox/sharedlibs@2611 5e6a8d80-dfce-4ca6-a32a-6e07a63d50c8