PEMA-103 Deleted unused file

Cargo.toml.tmp was used to replace the cargo.toml inside of pEpEngineSequoiaBackend, as the entire lib has been updated to generate the proper libraries, this is no longer necessary.

android/external/Cargo.toml.tmp

@@ -1,44 +0,0 @@
-[package]
-name = "pep_engine_sequoia_backend"
-description = "An implementation of the p≡p Engine's cryptotech interface using Sequoia."
-version = "0.1.0"
-authors = ["Neal H. Walfield <neal@pep.foundation>"]
-homepage = "https://sequoia-pgp.org/"
-repository = "https://gitea.pep.foundation/neal/pEpEngineSequoiaBackend/"
-readme = "README.md"
-keywords = ["cryptography", "openpgp", "pgp", "encryption", "signing"]
-categories = ["cryptography", "authentication", "email"]
-license = "GPL-3.0-or-later"
-edition = "2018"
-
-[badges]
-maintenance = { status = "actively-developed" }
-
-[dependencies]
-anyhow = "1"
-backtrace = "0.3.61"
-chrono = "0.4"
-enumber = "0.3"
-lazy_static = "1"
-libc = "0.2"
-lru = "0.6.6"
-memmem = "0.1"
-memoffset = "0.6"
-# When bumping the version of Sequoia search the code for XXX to find
-# spots where we can take advantage of new features.
-sequoia-openpgp = { version = "1.0", default-features = false }
-thiserror = "1"
-
-[dependencies.rusqlite]
-version = "0.25"
-features = ["bundled", "collation", "blob"]
-
-[lib]
-crate-type = ["lib", "cdylib", "staticlib"]
-
-[features]
-default = [
-    "sequoia-openpgp/default",
-]
-crypto-nettle = ["sequoia-openpgp/crypto-nettle"]
-crypto-cng = ["sequoia-openpgp/crypto-cng"]