Makefile.in: add update-build-tools target * Makefile.in: add update-build-tools target * src/build-autoconf.mk, src/build-automake.mk, src/build-bison.mk, src/build-gawk.mk, src/build-gcc.mk, src/build-gettext.mk, src/build-gperf.mk, src/build-m4.mk, src/build-texinfo.mk, src/build-libtool.mk : update PKG_UPDATE for getting latest version from gnu.org * src/build-cmake.mk, src/build-flex.mk, src/build-lzip.mk, src/build-pkg-config.mk, src/pkg-config.mk, src/build-scons.mk : add implemented PKG_UPDATE macro

--- a/src/build-lzip.mk	Wed Nov 22 16:59:33 2017 -0500
+++ b/src/build-lzip.mk	Thu Nov 23 12:05:29 2017 -0500
@@ -11,8 +11,9 @@
 $(PKG)_DEPS     :=
 
 define $(PKG)_UPDATE
-    echo 'Warning: Updates are temporarily disabled for package $(PKG).' >&2;
-    echo $($(PKG)_VERSION)
+    $(WGET) -q -O- http://download.savannah.gnu.org/releases/lzip | \
+    $(SED) -n 's,.*<a href="lzip-\([0-9][\.0-9]*\)\.tar\.gz.*,\1,p' | \
+    $(SORT) -V | tail -1
 endef
 
 define $(PKG)_BUILD