Fix backslashes in bits_pthread macros

src/header/bits_pthread/cbindgen.toml

@@ -11,19 +11,19 @@ after_includes = """
 #define PTHREAD_ONCE_INIT ((pthread_once_t){0})
 #define PTHREAD_RWLOCK_INITIALIZER ((pthread_rwlock_t){0})
 
-#define pthread_cleanup_push(routine, arg) do { \
-  struct { \
-    void (*routine)(void *); \
-    void *arg; \
-    void *prev; \
-  } __relibc_internal_pthread_ll_entry = { \
-    .routine = (void (*)(void *))(routine), \
-    .arg = (void *)(arg), \
-  }; \
+#define pthread_cleanup_push(routine, arg) do { \\
+  struct { \\
+    void (*routine)(void *); \\
+    void *arg; \\
+    void *prev; \\
+  } __relibc_internal_pthread_ll_entry = { \\
+    .routine = (void (*)(void *))(routine), \\
+    .arg = (void *)(arg), \\
+  }; \\
   __relibc_internal_pthread_cleanup_push(&__relibc_internal_pthread_ll_entry);
 
-#define pthread_cleanup_pop(execute) \
-  __relibc_internal_pthread_cleanup_pop((execute)); \
+#define pthread_cleanup_pop(execute) \\
+  __relibc_internal_pthread_cleanup_pop((execute)); \\
 } while(0)
 
 """