message: cmake(android): update CMAKE_FIND_ROOT_PATH_MODE_* handling
  Avoids this error message with CMake 3.10:
  CMake Error: CMake was unable to find a build program corresponding to "Ninja".
  CMAKE_MAKE_PROGRAM is not set. You probably need to select a different build tool.
  Related changes is that pkg-config tool is found (/usr/bin/pkg-config).
diff: @@ -1596,16 +1596,49 @@ set( CMAKE_FIND_ROOT_PATH
  "${CMAKE_INSTALL_PREFIX}/share" )
  # only search for libraries and includes in the ndk toolchain
  -set( CMAKE_FIND_ROOT_PATH_MODE_PROGRAM ONLY )
  +if(NOT CMAKE_FIND_ROOT_PATH_MODE_LIBRARY)
  set( CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY )
  +endif()
  +
  +if(NOT CMAKE_FIND_ROOT_PATH_MODE_INCLUDE)
  set( CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY )
  +endif()
  +if(NOT CMAKE_FIND_ROOT_PATH_MODE_PACKAGE)
  + set( CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY )
  +endif()
  +
  +if(NOT CMAKE_FIND_ROOT_PATH_MODE_PROGRAM)
  + set( CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER )
  +endif()
  +
  +macro(__cmake_find_root_save_and_reset)
  + foreach(v
  + CMAKE_FIND_ROOT_PATH_MODE_LIBRARY
  + CMAKE_FIND_ROOT_PATH_MODE_INCLUDE
  + CMAKE_FIND_ROOT_PATH_MODE_PACKAGE
  + CMAKE_FIND_ROOT_PATH_MODE_PROGRAM
  + )
  + set(__save_${v} ${${v}})
  + set(${v} NEVER)
  + endforeach()
  +endmacro()
  +
  +macro(__cmake_find_root_restore)
  + foreach(v
  + CMAKE_FIND_ROOT_PATH_MODE_LIBRARY
  + CMAKE_FIND_ROOT_PATH_MODE_INCLUDE
  + CMAKE_FIND_ROOT_PATH_MODE_PACKAGE
  + CMAKE_FIND_ROOT_PATH_MODE_PROGRAM
  + )
  + set(${v} ${__save_${v}})
  + unset(__save_${v})
  + endforeach()
  +endmacro()
  # macro to find packages on the host OS
  macro( find_host_package )
  - set( CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER )
  - set( CMAKE_FIND_ROOT_PATH_MODE_LIBRARY NEVER )
  - set( CMAKE_FIND_ROOT_PATH_MODE_INCLUDE NEVER )
  + __cmake_find_root_save_and_reset()
  if( CMAKE_HOST_WIN32 )
  SET( WIN32 1 )
  SET( UNIX )
  @@ -1617,17 +1650,13 @@ macro( find_host_package )
  SET( WIN32 )
  SET( APPLE )
  SET( UNIX 1 )
  - set( CMAKE_FIND_ROOT_PATH_MODE_PROGRAM ONLY )
  - set( CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY )
  - set( CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY )
  + __cmake_find_root_restore()
  endmacro()
  # macro to find programs on the host OS
  macro( find_host_program )
  - set( CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER )
  - set( CMAKE_FIND_ROOT_PATH_MODE_LIBRARY NEVER )
  - set( CMAKE_FIND_ROOT_PATH_MODE_INCLUDE NEVER )
  + __cmake_find_root_save_and_reset()
  if( CMAKE_HOST_WIN32 )
  SET( WIN32 1 )
  SET( UNIX )
  @@ -1639,9 +1668,7 @@ macro( find_host_program )
  SET( WIN32 )
  SET( APPLE )
  SET( UNIX 1 )
  - set( CMAKE_FIND_ROOT_PATH_MODE_PROGRAM ONLY )
  - set( CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY )
  - set( CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY )
  + __cmake_find_root_restore()
  endmacro()
  