Fixup autotools.bbclass for samba-3.0.25c

From: Dan Williams <dan.j.williams@intel.com>

1/ The 'acpaths' finding script does not go deep enough for samba.
2/ The .m4 files in samba-3.0.25c/source/lib/replace are not picked up by
   autoreconf, so export acpaths as the environment variable M4PATH
---

 classes/autotools.bbclass |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/classes/autotools.bbclass b/classes/autotools.bbclass
index fccf2b6..2f01b85 100644
--- a/classes/autotools.bbclass
+++ b/classes/autotools.bbclass
@@ -86,11 +86,14 @@ autotools_do_configure() {
 			olddir=`pwd`
 			cd ${S}
 			if [ x"${acpaths}" = xdefault ]; then
+				m4path=	
 				acpaths=
-				for i in `find ${S} -maxdepth 2 -name \*.m4|grep -v 'aclocal.m4'| \
+				for i in `find ${S} -maxdepth 3 -name \*.m4|grep -v 'aclocal.m4'| \
 					grep -v 'acinclude.m4' | sed -e 's,\(.*/\).*$,\1,'|sort -u`; do
 					acpaths="$acpaths -I $i"
+					m4path="$m4path:$i"
 				done
+				export M4PATH=$m4path
 			else
 				acpaths="${acpaths}"
 			fi