message: Add check for ANDROID_NDK, and error if not set when building android
diff: @@ -56,6 +56,9 @@ if(ANDROID)
  if(NOT DEFINED ENV{ANDROID_SDK})
  message(FATAL_ERROR "ANDROID_SDK environment variable must be defined for Android build")
  endif()
  + if(NOT DEFINED ENV{ANDROID_NDK})
  + message(FATAL_ERROR "ANDROID_NDK environment variable must be defined for Android build")
  + endif()
  if(STRIP_ANDROID_LIBRARY AND CMAKE_STRIP AND CMAKE_BUILD_TYPE STREQUAL "Release")
  add_custom_command(TARGET renderdoccmd POST_BUILD
  