Fix crash on big-endian systems when calling _glfwAppendDictDataDBusPOSIX()

See https://github.com/libsdl-org/SDL/pull/14029 for reference

src/posix_dbus.c

@@ -35,6 +35,7 @@
 #include <unistd.h>
 #include <stdio.h>
 #include <ctype.h>
+#include <assert.h>
 
 void _glfwInitDBusPOSIX(void)
 {
@@ -436,7 +437,9 @@ dbus_bool_t _glfwAppendDictDataDBusPOSIX(struct DBusMessageIter* iterator, int k
     if(!_glfwAppendDataDBusPOSIX(&keyIterator, keyType, keyData))
         return GLFW_FALSE;
 
-    if(!_glfwOpenContainerDBusPOSIX(&keyIterator, DBUS_TYPE_VARIANT, (const char*)&valueType, &valueIterator))
+    char* valueTypeStr = _glfwDBusTypeToStrPOSIX(valueType);
+    assert(valueTypeStr != NULL);
+    if(!_glfwOpenContainerDBusPOSIX(&keyIterator, DBUS_TYPE_VARIANT, valueTypeStr, &valueIterator))
         return GLFW_FALSE;
 
     //Append value data
@@ -471,3 +474,46 @@ dbus_bool_t _glfwSendMessageDBusPOSIX(struct DBusMessage* message)
 
     return GLFW_TRUE;
 }
+
+char* _glfwDBusTypeToStrPOSIX(int valueType)
+{
+    switch (valueType)
+    {
+        case DBUS_TYPE_STRING:
+            return DBUS_TYPE_STRING_AS_STRING;
+        case DBUS_TYPE_ARRAY:
+            return DBUS_TYPE_ARRAY_AS_STRING;
+        case DBUS_TYPE_DICT_ENTRY:
+            return DBUS_TYPE_DICT_ENTRY_AS_STRING;
+        case DBUS_TYPE_VARIANT:
+            return DBUS_TYPE_VARIANT_AS_STRING;
+        case DBUS_TYPE_BOOLEAN:
+            return DBUS_TYPE_BOOLEAN_AS_STRING;
+        case DBUS_TYPE_DOUBLE:
+            return DBUS_TYPE_DOUBLE_AS_STRING;
+        case DBUS_TYPE_INT16:
+            return DBUS_TYPE_INT16_AS_STRING;
+        case DBUS_TYPE_UINT16:
+            return DBUS_TYPE_UINT16_AS_STRING;
+        case DBUS_TYPE_INT32:
+            return DBUS_TYPE_INT32_AS_STRING;
+        case DBUS_TYPE_UINT32:
+            return DBUS_TYPE_UINT32_AS_STRING;
+        case DBUS_TYPE_INT64:
+            return DBUS_TYPE_INT64_AS_STRING;
+        case DBUS_TYPE_UINT64:
+            return DBUS_TYPE_UINT64_AS_STRING;
+        case DBUS_TYPE_STRUCT_OPEN:
+            return DBUS_TYPE_STRUCT_OPEN_AS_STRING;
+        case DBUS_TYPE_STRUCT_CLOSE:
+            return DBUS_TYPE_STRUCT_CLOSE_AS_STRING;
+        case DBUS_TYPE_BYTE:
+            return DBUS_TYPE_BYTE_AS_STRING;
+        case DBUS_TYPE_OBJECT_PATH:
+            return DBUS_TYPE_OBJECT_PATH_AS_STRING;
+        case DBUS_TYPE_SIGNATURE:
+            return DBUS_TYPE_SIGNATURE_AS_STRING;
+    }
+
+    return NULL;
+}

src/posix_dbus.h

@@ -80,6 +80,24 @@ struct DBusMessageIter
 #define DBUS_TYPE_OBJECT_PATH (unsigned int)'o'
 #define DBUS_TYPE_SIGNATURE (unsigned int)'g'
 
+#define DBUS_TYPE_STRING_AS_STRING "s"
+#define DBUS_TYPE_ARRAY_AS_STRING "a"
+#define DBUS_TYPE_DICT_ENTRY_AS_STRING "e"
+#define DBUS_TYPE_VARIANT_AS_STRING "v"
+#define DBUS_TYPE_BOOLEAN_AS_STRING "b"
+#define DBUS_TYPE_DOUBLE_AS_STRING "d"
+#define DBUS_TYPE_INT16_AS_STRING "n"
+#define DBUS_TYPE_UINT16_AS_STRING "q"
+#define DBUS_TYPE_INT32_AS_STRING "i"
+#define DBUS_TYPE_UINT32_AS_STRING "u"
+#define DBUS_TYPE_INT64_AS_STRING "x"
+#define DBUS_TYPE_UINT64_AS_STRING "t"
+#define DBUS_TYPE_STRUCT_OPEN_AS_STRING "("
+#define DBUS_TYPE_STRUCT_CLOSE_AS_STRING ")"
+#define DBUS_TYPE_BYTE_AS_STRING "y"
+#define DBUS_TYPE_OBJECT_PATH_AS_STRING "o"
+#define DBUS_TYPE_SIGNATURE_AS_STRING "g"
+
 typedef void (* PFN_dbus_error_init)(struct DBusError*);
 typedef dbus_bool_t (* PFN_dbus_error_is_set)(const struct DBusError*);
 typedef void (* PFN_dbus_error_free)(struct DBusError*);
@@ -156,3 +174,4 @@ dbus_bool_t _glfwCloseContainerDBusPOSIX(struct DBusMessageIter* iterator, struc
 dbus_bool_t _glfwAppendDataDBusPOSIX(struct DBusMessageIter* iterator, int DBusType, const void* data);
 dbus_bool_t _glfwAppendDictDataDBusPOSIX(struct DBusMessageIter* iterator, int keyType, const void* keyData, int valueType, const void* valueData);
 dbus_bool_t _glfwSendMessageDBusPOSIX(struct DBusMessage* message);
+char* _glfwDBusTypeToStrPOSIX(int valueType);