CMakeList.txt typos for ssl

[lilltiger]

In the current master branch (4.8) there are typos in the CMakeList.txt:

cmake -DBUILD_SSL=YES ..

CMake Error at cmake/Findopenssl.cmake:22 (message):
  Failed to locate OpenSSL dependency.  see restbed/dependency/openssl
Call Stack (most recent call first):
  CMakeLists.txt:60 (find_package)

Fix:

-- find_package( openssl REQUIRED )
++ find_package( OpenSSL REQUIRED )

When this is fixed there are a few other typos:

cmake -DBUILD_SSL=YES ..


crypto_LIBRARY_STATIC
    linked by target "restbed-static" in directory /srv/rest/restbed

ssl_LIBRARY_STATIC
    linked by target "restbed-static" in directory /srv/rest/restbed

Fix (several instances in the file):

-- crypto_LIBRARY_STATIC
++ CRYPTO_LIBRARY_STATIC

-- ssl_LIBRARY_STATIC
++ SSL_LIBRARY_STATIC