Updated autogen.sh



git-svn-id: svn+ssh://svn.code.sf.net/p/cmusphinx/code/trunk/sphinxbase@12623 94700074-3cef-4d97-a70e-9c8c206c02f5
Replace INCLUDES with AM_CFLAGS



git-svn-id: svn+ssh://svn.code.sf.net/p/cmusphinx/code/trunk/sphinxbase@12624 94700074-3cef-4d97-a70e-9c8c206c02f5
There is no need to expose backend in public headers



git-svn-id: svn+ssh://svn.code.sf.net/p/cmusphinx/code/trunk/sphinxbase@12625 94700074-3cef-4d97-a70e-9c8c206c02f5