Makefile.in: fix asbolute symlink of libfaifa.so

Fixes #7

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Makefile.in: fix missing dependencies on install rule

install would invoke the strip rule which does not make sure it builds
faifa and libfaifa.so, fix that.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>