Use modified setup for building vendored libsecp256k1#5

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IvantheTricourne wants to merge 8 commits intohaskell-bitcoin:masterfrom

f-o-a-m:vendor-libsecp256k1

Commits on Apr 20, 2023

Use modified setup for building vendored libsecp256k1
IvantheTricourne
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Commits on Apr 21, 2023

we're building secp256k1 now, so no need for it to be in pkg-config
iostat
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use sh libtoolize so that PATHs get properly picked up on most systems, and enable schnorr as this lib has bindings to it
iostat
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depend on secp256k1 0.2.0, since that what this lib seems to assume, whereas the HEAD that was submoduled is... well, master...
iostat
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install libtoolize in travis so we can build, and remove libsecp256k1 dep in travis since we're building our own
iostat
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actually build the library using our custom setup, add no-error on deprecations since Prim marks them as well
iostat
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bump version to 0.2.0, since we're depending on libsecp256k1-0.2.0
iostat
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properly invoke libtoolize on non-macOS
iostat
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