autotools.mk: fix gettext fixup

The update to gettext 0.21 broke packages that use autotools and
gettext because the sed line was failing with the new version. Fix with
a better sed expression.

Signed-off-by: Rosen Penev <[email protected]>

include/autotools.mk

@@ -90,7 +90,7 @@ endef
 
 define gettext_version_target
 	(cd $(PKG_BUILD_DIR) && \
-		GETTEXT_VERSION=$(shell $(STAGING_DIR_HOSTPKG)/bin/gettext -V | $(STAGING_DIR_HOST)/bin/sed -ne '1s/.*\([0-9]\.[0-9]\{2\}\.[0-9]\).*/\1/p' ) && \
+		GETTEXT_VERSION=$(shell $(STAGING_DIR_HOSTPKG)/bin/gettext -V | $(STAGING_DIR_HOST)/bin/sed -rne '1s/.*\b([0-9]\.[0-9]+(\.[0-9]+)?)\b.*/\1/p' ) && \
 		$(STAGING_DIR_HOST)/bin/sed \
 			-i $(PKG_BUILD_DIR)/configure.ac \
 			-e "s/AM_GNU_GETTEXT_VERSION(.*)/AM_GNU_GETTEXT_VERSION(\[$$$$GETTEXT_VERSION\])/g" && \