vendor libsecret

The libsecret-rs crate is unmaintained, so I'm vendoring it for
now. Bumping the glib version turned out to be enough.

The exact process I used was:
1. Cloning the repository
2. Making changes
3. `cargo build` to ensure it works
4. `cargo package --no-verify` (b/c it tries to build all crates
separately instead of the entire workspace as a whole)
5. `mkdir libsecret/sys -p`
6. `tar --strip-components 1 -C libsecret -xvf ../libsecret-rs/target/package/libsecret-0.6.0.crate`
7. `tar --strip-components 1 -C libsecret/sys -xvf ../libsecret-rs/target/package/libsecret-sys-0.6.0.crate`

Then `Cargo.toml` is modified to ensure the libsecret and its `-sys`
crate build out of my vendored sources.

In the future, if I gain maintainership of the `libsecret` crate, I
could just revert this commit to make it point back to the upstream.

1 files changed, 37 insertions, 0 deletions

diff --git a/libsecret/src/schema.rs b/libsecret/src/schema.rs
new file mode 100644
index 0000000..b3252e2
--- /dev/null
+++ b/libsecret/src/schema.rs
@@ -0,0 +1,37 @@
+use crate::{Schema, SchemaAttributeType, SchemaFlags};
+use glib::translate::*;
+use std::collections::HashMap;
+
+impl Schema {
+    #[doc(alias = "secret_schema_new")]
+    #[doc(alias = "secret_schema_newv")]
+    pub fn new(
+        name: &str,
+        flags: SchemaFlags,
+        attribute_names_and_types: HashMap<&str, SchemaAttributeType>,
+    ) -> Self {
+        unsafe {
+            let hash_table = glib::ffi::g_hash_table_new_full(
+                Some(glib::ffi::g_str_hash),
+                Some(glib::ffi::g_str_equal),
+                Some(glib::ffi::g_free),
+                None,
+            );
+
+            for (name, type_) in attribute_names_and_types {
+                let key_ptr: *mut libc::c_char = name.to_glib_full();
+                glib::ffi::g_hash_table_insert(
+                    hash_table,
+                    key_ptr as *mut _,
+                    type_.into_glib() as *mut _,
+                );
+            }
+
+            from_glib_full(ffi::secret_schema_newv(
+                name.to_glib_none().0,
+                flags.into_glib(),
+                hash_table,
+            ))
+        }
+    }
+}