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When an environment variable "SIGNING_TOOL" is defined, the make will
call this with two filename arguments: <input> and <output>.
The SIGNING_TOOL will read in the binary from input, and append
signature to the output. For example:
SIGNING_TOOL=${PWD}/Tools/cryptotools.py make px4_fmu-v5_default
Will use the example "cryptotools.py" to sign the px4_fmu-v5.bin
Signed-off-by: Jukka Laitinen <jukkax@ssrc.tii.ae>