Tests

Merge pull request #199 from LLFourn/libsecp_compat_0_30 #840

Job	Run time
clippy_check	17s
build	30s
Rustfmt	13s
doc-build	21s
test (x86_64-unknown-linux-gnu)	3m 21s
test-alloc (secp256kfun)	54s
test (armv7-unknown-linux-gnueabihf)	6m 57s
test-minimal (secp256kfun)	1m 11s
test-alloc (sigma_fun)	2m 50s
test-nightly	56s
test-minimal (sigma_fun)	2m 46s
test-alloc (ecdsa_fun)	41s
test-minimal (ecdsa_fun)	46s
test-alloc (schnorr_fun)	59s
test-minimal (schnorr_fun)	49s
	23m 31s

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