Update to newer versions of libtool and gettext

Building VLC requires newer version of gettext, see https://f-droid.org/wiki/page/org.videolan.vlc/lastbuild_12000605. Also there seems to be an issue with libtool, which I don't know what to do about. The build works with my system, I have installed gettext (GNU gettext-runtime) 0.19.7, libtool (GNU libtool) 2.4.6 and libtoolize (GNU libtool) 2.4.6. Jessie should have gettext 0.19.3-2 and libtool 2.4.2-1.11. I am note sure how to proceed.

Please note that we are really out-of-date in regards of VLC, so we should indeed fix this and not wait until time fixes this.

Cc: @mvdan, @eighthave, @CiaranG

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