message: Check that when building for android that Java >= 1.8 is in the PATH
  * This is independent of what JAVA_HOME points to, because some of the android
  tools just run 'java' without checking it.
diff: @@ -53,12 +53,30 @@ if(ANDROID)
  if(NOT DEFINED ENV{JAVA_HOME})
  message(FATAL_ERROR "JAVA_HOME environment variable must be defined for Android build")
  endif()
  + message(STATUS "Using JAVA_HOME = $ENV{JAVA_HOME}")
  +
  if(NOT DEFINED ENV{ANDROID_SDK})
  message(FATAL_ERROR "ANDROID_SDK environment variable must be defined for Android build")
  endif()
  + message(STATUS "Using ANDROID_SDK = $ENV{ANDROID_SDK}")
  +
  if(NOT DEFINED ENV{ANDROID_NDK})
  message(FATAL_ERROR "ANDROID_NDK environment variable must be defined for Android build")
  endif()
  + message(STATUS "Using ANDROID_NDK = $ENV{ANDROID_NDK}")
  +
  + #############################
  + # We need to check that 'java' in PATH is new enough. Temporarily unset the JAVA_HOME env,
  + # then invoke FindJava.cmake which will search just the PATH, then re-set it.
  + set(SAVE_JAVA_HOME $ENV{JAVA_HOME})
  +
  + set(ENV{JAVA_HOME} "")
  + find_package(Java)
  + set(ENV{JAVA_HOME} ${SAVE_JAVA_HOME})
  +
  + if(${Java_VERSION} VERSION_LESS 1.8)
  + message(FATAL_ERROR "Building Android requires the 'java' program in your PATH to be at least Java 8 (1.8)")
  + endif()
  if(STRIP_ANDROID_LIBRARY AND CMAKE_STRIP AND CMAKE_BUILD_TYPE STREQUAL "Release")
  add_custom_command(TARGET renderdoccmd POST_BUILD
  