Merge pull request #277 from koreader/chrox-master

install openssl libraries on Android
replace viewport check by clamping

The viewport dimension check was buggy (wrong upper limits).
We don't need it there anyway, rather, we clamp the coordinates
in the viewport() implementation in the Blitbuffer API.
Merge pull request #278 from hwhw/master

replace viewport check by clamping
fix no openssl libversion
We need to install openssl libraries because the blank LIBVERSION
variable is not reliable to get rid of the major and minor versions
in the soname of libssl and libcrypto. To make this consistent on all
platforms it's choosen to add the version info in the soname. It should
work on Android (libraries installed in the apk) and Kindle
(libssl.so.1.0.0 is in /usr/lib). If it fails on Kobo (as it always
would be) we probably need to ship with openssl libraries for all platform.