src/ndk.h: Do not #error if 'NDK' is undefined

Author: simpl

src/ndk.h

@@ -28,11 +28,6 @@
 #endif
 
 
-#if !(NDK)
-#error At least one module requires the Nginx Development Kit to be compiled with \
-the source (add --with-module=/path/to/devel/kit/src to configure command)
-#endif
-
 #include <ndk_config.h>