Restore auto-switch to bundled ssl if WITH_SSL=yes

if -DWITH_SSL=yes and system ssl cannot be used,
bundled ssl should be auto-selected.

That's how it worked in 10.0, and it was unintentionally broken in 10.1.

cmake/ssl.cmake

@@ -180,8 +180,7 @@ MACRO (MYSQL_CHECK_SSL)
         OPENSSL_MAJOR_VERSION "${OPENSSL_VERSION_NUMBER}"
       )
       MESSAGE(STATUS "OPENSSL_MAJOR_VERSION = ${OPENSSL_MAJOR_VERSION}")
-     ENDIF()
-     IF(TRUE) #OPENSSL_MAJOR_VERSION GREATER 0)
+
       SET(SSL_SOURCES "")
       SET(SSL_LIBRARIES ${OPENSSL_LIBRARIES} ${CRYPTO_LIBRARY})
       IF(CMAKE_SYSTEM_NAME MATCHES "SunOS")