Add openssl support for optware and entware router

[cxgreat2014]

Add "/opt/lib/libcrypto.so.1.0.0" support for optware and entware router

[ysc3839]

I tested. There's two versions of libcrypto in my router. /lib/libcrypt-0.9.33.2.so(version 01000115F) and /lib/libcrypto.so.1.0.0(version 0100020AF).

Benchmark:

OpenSSL version 01000115F
<CDLL '/usr/local/ssl/lib/libcrypto.so', handle 804c58 at 7d5f00>
100x Verified True 36.356418848

OpenSSL version 0100020AF
<CDLL '/usr/local/ssl/lib/libcrypto.so.1.0.0', handle 9098d8 at 842720>
100x Verified True 27.0174210072

(In fact it's 1000x. for i in range(1000):)

[cxgreat2014]

@ysc3839 if python -c "import ctypes.util; print ctypes.util.find_library('crypto')" work on your device, we needn't to do other change

[ysc3839]

There's two versions of libcrypto. One is from the firmware and the other one is from Entware. The one from Entware is newer and faster.