Makefile: Cleanup following recent change in the SDK #981

Job	Run time
Compilation for NanoS, X, S+, and Stax (nanos, $NANOS_SDK)	1m 33s
Compilation for NanoS, X, S+, and Stax (nanox, $NANOX_SDK)	2m 13s
Compilation for NanoS, X, S+, and Stax (nanosp, $NANOSP_SDK)	2m 8s
Compilation for NanoS, X, S+, and Stax (stax, $STAX_SDK)	2m 4s
Tests with the Python library and legacy Bitcoin app	1m 0s
Tests with the JS library	1m 55s
Tests (nanos)	10m 3s
Tests (nanox)	12m 26s
Tests (nanosp)	8m 55s
Tests (stax)	12m 21s
Tests on mainnet (nanos)	43s
Tests on mainnet (nanox)	37s
Tests on mainnet (nanosp)	42s
Tests on mainnet (stax)	51s
Tests for rust client library	3m 31s
Unit test	2m 44s
	1h 3m 46s

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