48439b3c10 Don't link SSL_LIBS with GUI unless BIP70 is enabled (James Hilliard)
fbb643d2a5 Add BIP70 deprecation warning (James Hilliard)
38b98507cd qt: cleanup: Move BIP70 functions together in paymentserver (Wladimir J. van der Laan)
9dcf6c0dfe build: Add --disable-bip70 configure option (Wladimir J. van der Laan)
Pull request description:
This is based off of #11622 and adds a deprecation warning when a BIP70 URL is used.
Rational:
- BIP70 increases attack surface in multiple ways and is difficult for third party wallets to implement in a secure manner
- Very few merchants use the standard BIP70 variant supported by Bitcoin Core
- The one major payment processor that doesn't support BIP21 and currently uses a customized non-standard version of BIP70 has indicated that "Unfortunately the original BIP70 is not useful for us."
Tree-SHA512: 1e16ee8d2cdac9499f751ee7b50d058278150f9e38a87a47ddb5105dd0353cdedabe462903f54ead6209b249b249fe5e6a10d29631531be27400f2f69c25b9b9
9886590116