fix: bigint extern functions were not updated on macro usage

[jonathanpwang]

@arayikhalatyan can you help add some unit tests for extern functions in this repo for the future?

[github-actions]

group	app.proof_time_ms	app.cycles	app.cells_used	leaf.proof_time_ms	leaf.cycles	leaf.cells_used
verify_fibair	(+30 [+0.9%]) 3,542	711,284	25,510,945	-	-	-
fibonacci_program	(+10 [+0.2%]) 6,113	1,500,137	51,505,102	-	-	-
regex_program	(+69 [+0.4%]) 18,980	4,190,904	165,028,173	-	-	-
ecrecover_program	(-11 [-0.4%]) 2,605	285,401	15,092,297	-	-	-

Commit: 3ab937e

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