cmake: stop passing unused C macros

- `-DCPPFLAGS`: probably a copy-paste typo from the initial CMake
  commit.

- `-DNO_CRYPT`: `NO_CRYPT` is no longer used in the source and this
  macro is no longer set by autotools.

CMakeLists.txt

@@ -129,7 +129,7 @@ if(WIN32)
 	add_definitions(-D_CRT_SECURE_NO_WARNINGS)
 	add_definitions(-D_CRT_DEPRECATED_NO_WARNINGS)
 	add_definitions(-D_REENTRANT -D_POSIX_THREAD_SAFE_FUNCTIONS)
-	add_definitions(-DCPPFLAGS -DNO_SYSLOG -DNO_CRYPT)
+	add_definitions(-DNO_SYSLOG)
 	add_definitions(-DWIN32_LEAN_AND_MEAN)
 	if(NOT CMAKE_SYSTEM_NAME MATCHES "WindowsStore")
 		add_definitions(-D_WIN32_WINNT=0x0600)