pkg-autotools: search in the entire source directory for ltmain.sh

Fixes static linking of berkeleydb package, where ltmain.sh
is not in the sub-directory that contains configure.
Always search the complete source directory.

Fixes:
 http://autobuild.buildroot.net/results/f0a96f671644d9f9efcf245b354affdc84f7d7da

Signed-off-by: Waldemar Brodkorb <wbx@openadk.org>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/pkg-autotools.mk

@@ -59,7 +59,7 @@ endef
 #
 define LIBTOOL_PATCH_HOOK
 	@$(call MESSAGE,"Patching libtool")
-	$(Q)for i in `find $($(PKG)_SRCDIR) -name ltmain.sh`; do \
+	$(Q)for i in `find $($(PKG)_DIR) -name ltmain.sh`; do \
 		ltmain_version=`sed -n '/^[ \t]*VERSION=/{s/^[ \t]*VERSION=//;p;q;}' $$i | \
 		sed -e 's/\([0-9]*\.[0-9]*\).*/\1/' -e 's/\"//'`; \
 		ltmain_patchlevel=`sed -n '/^[ \t]*VERSION=/{s/^[ \t]*VERSION=//;p;q;}' $$i | \