DESTDIR compatibility

Signed-off-by: Vadim A. Misbakh-Soloviov <mva@mva.name>
LuaJIT semi-compatibility (actually, buildsystem itself need to be rewritten properly)

Signed-off-by: Vadim A. Misbakh-Soloviov <mva@mva.name>
make config improvements (make values redefinable by buildscript)

Signed-off-by: Vadim A. Misbakh-Soloviov <mva@mva.name>
Merge pull request #4 from msva/master

DESTDIR compatibility + LuaJIT compatibility