Add a "fork" of musl as //fusl.

fusl/arch/sh/bits/shm.h

+#define SHMLBA 16384
+
+struct shmid_ds
+{
+        struct ipc_perm shm_perm;
+        size_t shm_segsz;
+        time_t shm_atime;
+        int __unused1;
+        time_t shm_dtime;
+        int __unused2;
+        time_t shm_ctime;
+        int __unused3;
+        pid_t shm_cpid;
+        pid_t shm_lpid;
+        unsigned long shm_nattch;
+        unsigned long __pad1;
+        unsigned long __pad2;
+};
+
+struct shminfo {
+        unsigned long shmmax, shmmin, shmmni, shmseg, shmall, __unused[4];
+};
+
+struct shm_info {
+        int __used_ids;
+        unsigned long shm_tot, shm_rss, shm_swp;
+        unsigned long __swap_attempts, __swap_successes;
+};