So this just happened to me last night, I can't compile BLtouch on an einsy board... did you ever get a response for this?
Arduino: 1.8.5 (Mac OS X), Board: "RAMBo"
sketch/Marlin_main.cpp: In function 'void servo_init()':
Marlin_main.cpp:950: error: 'STOW_Z_SERVO' was not declared in this scope
STOW_Z_SERVO();
^
sketch/Marlin_main.cpp: In function 'void bltouch_command(int)':
Marlin_main.cpp:2035: error: 'MOVE_SERVO' was not declared in this scope
MOVE_SERVO(Z_PROBE_SERVO_NR, angle); // Give the BL-Touch the command and wait
^
'STOW_Z_SERVO' was not declared in this scope
Arduino: 1.8.5 (Mac OS X), Board: "RAMBo"
sketch/Marlin_main.cpp: In function 'void servo_init()':
Marlin_main.cpp:950: error: 'STOW_Z_SERVO' was not declared in this scope
STOW_Z_SERVO();
^
sketch/Marlin_main.cpp: In function 'void bltouch_command(int)':
Marlin_main.cpp:2035: error: 'MOVE_SERVO' was not declared in this scope
MOVE_SERVO(Z_PROBE_SERVO_NR, angle); // Give the BL-Touch the command and wait
^
'STOW_Z_SERVO' was not declared in this scope