Update cargo recipe

recipes/cargo/recipe.sh

-GIT=https://gitlab.redox-os.org/redox-os/cargo.git
-GIT_UPSTREAM=https://github.com/rust-lang/cargo.git
-BRANCH=redox
-BUILD_DEPENDS=(curl openssl zlib)
-
-function recipe_build {
-    sysroot="$(realpath ../sysroot)"
-    export DEP_OPENSSL_ROOT="$sysroot"
-    export OPENSSL_DIR="$sysroot"
-    export DEP_Z_ROOT="$sysroot"
-}

recipes/cargo/recipe.toml

+[source]
+git = "https://gitlab.redox-os.org/redox-os/cargo.git"
+upstream = "https://github.com/rust-lang/cargo.git"
+branch = "redox-2022-03-18"
+
+[build]
+template = "custom"
+dependencies = [
+    "libssh2",
+    "openssl",
+    "zlib",
+]
+script = """
+export LIBSSH2_SYS_USE_PKG_CONFIG=1
+export LIBZ_SYS_STATIC=1
+cookbook_cargo
+"""