Comment 4 for bug 1531508

To reproduce:

$ wget http://font.ubuntu.com/download/ubuntu-font-family-0.83.zip && unzip ubuntu-font-family-0.83.zip
$ git clone <email address hidden>:khaledhosny/ots.git && cd ots
$ sed -i -e 's/std=c++11/std=c++0x/' Makefile.am
$ ./autogen.sh && ./configure && make
$ echo ../ubuntu-font-family-0.83/*.ttf | xargs -tn1 ./ot-sanitise
gg/ots/ot-sanitise gg/0.83/ubuntu-font-family-0.83/Ubuntu-BI.ttf
ERROR: LTSH: bad num_glyphs: 1268
ERROR: LTSH: Table discarded
gg/ots/ot-sanitise gg/0.83/ubuntu-font-family-0.83/Ubuntu-B.ttf
gg/ots/ot-sanitise gg/0.83/ubuntu-font-family-0.83/Ubuntu-C.ttf
gg/ots/ot-sanitise gg/0.83/ubuntu-font-family-0.83/Ubuntu-LI.ttf
ERROR: LTSH: bad num_glyphs: 1268
ERROR: LTSH: Table discarded
gg/ots/ot-sanitise gg/0.83/ubuntu-font-family-0.83/Ubuntu-L.ttf
gg/ots/ot-sanitise gg/0.83/ubuntu-font-family-0.83/Ubuntu-MI.ttf
ERROR: LTSH: bad num_glyphs: 1268
ERROR: LTSH: Table discarded
gg/ots/ot-sanitise gg/0.83/ubuntu-font-family-0.83/UbuntuMono-BI.ttf
gg/ots/ot-sanitise gg/0.83/ubuntu-font-family-0.83/UbuntuMono-B.ttf
gg/ots/ot-sanitise gg/0.83/ubuntu-font-family-0.83/UbuntuMono-RI.ttf
gg/ots/ot-sanitise gg/0.83/ubuntu-font-family-0.83/UbuntuMono-R.ttf
gg/ots/ot-sanitise gg/0.83/ubuntu-font-family-0.83/Ubuntu-M.ttf
ERROR: LTSH: bad num_glyphs: 1263
ERROR: LTSH: Table discarded
gg/ots/ot-sanitise gg/0.83/ubuntu-font-family-0.83/Ubuntu-RI.ttf
gg/ots/ot-sanitise gg/0.83/ubuntu-font-family-0.83/Ubuntu-R.ttf