autotools.mk: cope with Debian version strings in libtool

SVN-Revision: 32207

include/autotools.mk

@@ -1,5 +1,5 @@
 #
-# Copyright (C) 2007-2011 OpenWrt.org
+# Copyright (C) 2007-2012 OpenWrt.org
 #
 # This is free software, licensed under the GNU General Public License v2.
 # See /LICENSE for more information.
@@ -51,9 +51,9 @@ endef
 
 # 1: build dir
 define patch_libtool
-	(cd $(1); \
+	@(cd $(1); \
 		for lt in $$$$($$(STAGING_DIR_HOST)/bin/find . -name ltmain.sh); do \
-			lt_version="$$$$($$(STAGING_DIR_HOST)/bin/sed -ne 's,^[[:space:]]*VERSION=\([0-9]\.[0-9]\+\).*,\1,p' $$$$lt)"; \
+			lt_version="$$$$($$(STAGING_DIR_HOST)/bin/sed -ne 's,^[[:space:]]*VERSION="\?\([0-9]\.[0-9]\+\).*,\1,p' $$$$lt)"; \
 			case "$$$$lt_version" in \
 				1.5|2.2|2.4) echo "autotools.mk: Found libtool v$$$$lt_version - applying patch to $$$$lt"; \
 					(cd $$$$(dirname $$$$lt) && $$(PATCH) -N -s -p1 < $$(TOPDIR)/tools/libtool/files/libtool-v$$$$lt_version.patch || true) ;; \