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, 69 insertions, 0 deletions

diff --git a/libsecret/sys/tests/constant.c b/libsecret/sys/tests/constant.c
new file mode 100644
index 0000000..ff0f600
--- /dev/null
+++ b/libsecret/sys/tests/constant.c
@@ -0,0 +1,69 @@
+// 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 <stdio.h>
+
+#define PRINT_CONSTANT(CONSTANT_NAME) \
+    printf("%s;", #CONSTANT_NAME); \
+    printf(_Generic((CONSTANT_NAME), \
+                    char *: "%s", \
+                    const char *: "%s", \
+                    char: "%c", \
+                    signed char: "%hhd", \
+                    unsigned char: "%hhu", \
+                    short int: "%hd", \
+                    unsigned short int: "%hu", \
+                    int: "%d", \
+                    unsigned int: "%u", \
+                    long: "%ld", \
+                    unsigned long: "%lu", \
+                    long long: "%lld", \
+                    unsigned long long: "%llu", \
+                    float: "%f", \
+                    double: "%f", \
+                    long double: "%ld"), \
+           CONSTANT_NAME); \
+    printf("\n");
+
+int main() {
+    PRINT_CONSTANT(SECRET_BACKEND_EXTENSION_POINT_NAME);
+    PRINT_CONSTANT((gint) SECRET_BACKEND_LOAD_COLLECTIONS);
+    PRINT_CONSTANT((gint) SECRET_BACKEND_NONE);
+    PRINT_CONSTANT((gint) SECRET_BACKEND_OPEN_SESSION);
+    PRINT_CONSTANT((guint) SECRET_COLLECTION_CREATE_NONE);
+    PRINT_CONSTANT(SECRET_COLLECTION_DEFAULT);
+    PRINT_CONSTANT((guint) SECRET_COLLECTION_LOAD_ITEMS);
+    PRINT_CONSTANT((guint) SECRET_COLLECTION_NONE);
+    PRINT_CONSTANT(SECRET_COLLECTION_SESSION);
+    PRINT_CONSTANT((gint) SECRET_ERROR_ALREADY_EXISTS);
+    PRINT_CONSTANT((gint) SECRET_ERROR_EMPTY_TABLE);
+    PRINT_CONSTANT((gint) SECRET_ERROR_INVALID_FILE_FORMAT);
+    PRINT_CONSTANT((gint) SECRET_ERROR_IS_LOCKED);
+    PRINT_CONSTANT((gint) SECRET_ERROR_MISMATCHED_SCHEMA);
+    PRINT_CONSTANT((gint) SECRET_ERROR_NO_MATCHING_ATTRIBUTE);
+    PRINT_CONSTANT((gint) SECRET_ERROR_NO_SUCH_OBJECT);
+    PRINT_CONSTANT((gint) SECRET_ERROR_PROTOCOL);
+    PRINT_CONSTANT((gint) SECRET_ERROR_WRONG_TYPE);
+    PRINT_CONSTANT((guint) SECRET_ITEM_CREATE_NONE);
+    PRINT_CONSTANT((guint) SECRET_ITEM_CREATE_REPLACE);
+    PRINT_CONSTANT((guint) SECRET_ITEM_LOAD_SECRET);
+    PRINT_CONSTANT((guint) SECRET_ITEM_NONE);
+    PRINT_CONSTANT((gint) SECRET_SCHEMA_ATTRIBUTE_BOOLEAN);
+    PRINT_CONSTANT((gint) SECRET_SCHEMA_ATTRIBUTE_INTEGER);
+    PRINT_CONSTANT((gint) SECRET_SCHEMA_ATTRIBUTE_STRING);
+    PRINT_CONSTANT((guint) SECRET_SCHEMA_DONT_MATCH_NAME);
+    PRINT_CONSTANT((guint) SECRET_SCHEMA_NONE);
+    PRINT_CONSTANT((gint) SECRET_SCHEMA_TYPE_COMPAT_NETWORK);
+    PRINT_CONSTANT((gint) SECRET_SCHEMA_TYPE_NOTE);
+    PRINT_CONSTANT((guint) SECRET_SEARCH_ALL);
+    PRINT_CONSTANT((guint) SECRET_SEARCH_LOAD_SECRETS);
+    PRINT_CONSTANT((guint) SECRET_SEARCH_NONE);
+    PRINT_CONSTANT((guint) SECRET_SEARCH_UNLOCK);
+    PRINT_CONSTANT((guint) SECRET_SERVICE_LOAD_COLLECTIONS);
+    PRINT_CONSTANT((guint) SECRET_SERVICE_NONE);
+    PRINT_CONSTANT((guint) SECRET_SERVICE_OPEN_SESSION);
+    return 0;
+}