Revert "autotools.bbclass: using relative paths for acpaths"

This reverts commit aa66ef6598c84231577d139ec7be413e73fac2b1 since
bdwgc-native fails to build after it. Anything which runs with a
sub-configure will fail after this change. It therefore needs
rethinking.

(From OE-Core rev: f95a9e2c292a1551861220270838cf1eaaba85b9)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes/autotools.bbclass

@@ -130,8 +130,7 @@ autotools_do_configure() {
 		if [ x"${acpaths}" = xdefault ]; then
 			acpaths=
 			for i in `find ${S} -maxdepth 2 -name \*.m4|grep -v 'aclocal.m4'| \
-				grep -v 'acinclude.m4' | sed -e 's,\(.*/\).*$,\1,'|sort -u| \
-				sed -e 's,${S},\.,'`; do
+				grep -v 'acinclude.m4' | sed -e 's,\(.*/\).*$,\1,'|sort -u`; do
 				acpaths="$acpaths -I $i"
 			done
 		else