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, 35 insertions, 0 deletions

diff --git a/libsecret/sys/tests/layout.c b/libsecret/sys/tests/layout.c
new file mode 100644
index 0000000..37a6016
--- /dev/null
+++ b/libsecret/sys/tests/layout.c
@@ -0,0 +1,35 @@
+// Generated by gir (https://github.com/gtk-rs/gir @ 4dd714f7f3b1)
+// from 
+// from gir-files (https://github.com/gtk-rs/gir-files.git @ b9db716f1bb7)
+// DO NOT EDIT
+
+#include "manual.h"
+#include <stdalign.h>
+#include <stdio.h>
+
+int main() {
+    printf("%s;%zu;%zu\n", "SecretBackendFlags", sizeof(SecretBackendFlags), alignof(SecretBackendFlags));
+    printf("%s;%zu;%zu\n", "SecretBackendInterface", sizeof(SecretBackendInterface), alignof(SecretBackendInterface));
+    printf("%s;%zu;%zu\n", "SecretCollection", sizeof(SecretCollection), alignof(SecretCollection));
+    printf("%s;%zu;%zu\n", "SecretCollectionClass", sizeof(SecretCollectionClass), alignof(SecretCollectionClass));
+    printf("%s;%zu;%zu\n", "SecretCollectionCreateFlags", sizeof(SecretCollectionCreateFlags), alignof(SecretCollectionCreateFlags));
+    printf("%s;%zu;%zu\n", "SecretCollectionFlags", sizeof(SecretCollectionFlags), alignof(SecretCollectionFlags));
+    printf("%s;%zu;%zu\n", "SecretError", sizeof(SecretError), alignof(SecretError));
+    printf("%s;%zu;%zu\n", "SecretItem", sizeof(SecretItem), alignof(SecretItem));
+    printf("%s;%zu;%zu\n", "SecretItemClass", sizeof(SecretItemClass), alignof(SecretItemClass));
+    printf("%s;%zu;%zu\n", "SecretItemCreateFlags", sizeof(SecretItemCreateFlags), alignof(SecretItemCreateFlags));
+    printf("%s;%zu;%zu\n", "SecretItemFlags", sizeof(SecretItemFlags), alignof(SecretItemFlags));
+    printf("%s;%zu;%zu\n", "SecretPrompt", sizeof(SecretPrompt), alignof(SecretPrompt));
+    printf("%s;%zu;%zu\n", "SecretPromptClass", sizeof(SecretPromptClass), alignof(SecretPromptClass));
+    printf("%s;%zu;%zu\n", "SecretRetrievableInterface", sizeof(SecretRetrievableInterface), alignof(SecretRetrievableInterface));
+    printf("%s;%zu;%zu\n", "SecretSchema", sizeof(SecretSchema), alignof(SecretSchema));
+    printf("%s;%zu;%zu\n", "SecretSchemaAttribute", sizeof(SecretSchemaAttribute), alignof(SecretSchemaAttribute));
+    printf("%s;%zu;%zu\n", "SecretSchemaAttributeType", sizeof(SecretSchemaAttributeType), alignof(SecretSchemaAttributeType));
+    printf("%s;%zu;%zu\n", "SecretSchemaFlags", sizeof(SecretSchemaFlags), alignof(SecretSchemaFlags));
+    printf("%s;%zu;%zu\n", "SecretSchemaType", sizeof(SecretSchemaType), alignof(SecretSchemaType));
+    printf("%s;%zu;%zu\n", "SecretSearchFlags", sizeof(SecretSearchFlags), alignof(SecretSearchFlags));
+    printf("%s;%zu;%zu\n", "SecretService", sizeof(SecretService), alignof(SecretService));
+    printf("%s;%zu;%zu\n", "SecretServiceClass", sizeof(SecretServiceClass), alignof(SecretServiceClass));
+    printf("%s;%zu;%zu\n", "SecretServiceFlags", sizeof(SecretServiceFlags), alignof(SecretServiceFlags));
+    return 0;
+}