Switch from libcrypto_static to libcrypto target

libcrypto target offers the same static library as libcrypto_static.
Thus, there's no need to use libcrypto_static.

Test: make pbkdf2gen
      Run pbkdf2gen with and without a password and confirm it works
Bug: 26160319

Change-Id: I89a60b7521e6c3df91421d0edf64a71b8b2c20e0