CMake: declare that websockets depend on crypto

CMakeLists.txt

@@ -218,10 +218,11 @@ if(LIBVNCSERVER_HAVE_SYS_UIO_H)
     message(STATUS "Building crypto with builtin functions")
     set(CRYPTO_SOURCES ${COMMON_DIR}/rfbcrypto_included.c ${COMMON_DIR}/md5.c ${COMMON_DIR}/sha1.c)
   endif()
+  set(LIBVNCSERVER_HAVE_CRYPTO 1)
 endif(LIBVNCSERVER_HAVE_SYS_UIO_H)
 
 
-if(WITH_WEBSOCKETS)
+if(WITH_WEBSOCKETS AND LIBVNCSERVER_HAVE_CRYPTO)
   set(LIBVNCSERVER_WITH_WEBSOCKETS 1)
   if(GNUTLS_FOUND)
     message(STATUS "Building websockets with GnuTLS")
@@ -237,7 +238,7 @@ if(WITH_WEBSOCKETS)
     set(WEBSOCKET_LIBRARIES)
     set(WSSRCS ${LIBVNCSERVER_DIR}/rfbssl_none.c)
   endif()
-endif(WITH_WEBSOCKETS)
+endif(WITH_WEBSOCKETS AND LIBVNCSERVER_HAVE_CRYPTO)
 
 if(WITH_GCRYPT AND LIBGCRYPT_LIBRARIES)
   message(STATUS "Found libgcrypt: ${LIBGCRYPT_LIBRARIES}")