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

fusl/arch/mips/bits/errno.h

+#define EPERM            1
+#define ENOENT           2
+#define ESRCH            3
+#define EINTR            4
+#define EIO              5
+#define ENXIO            6
+#define E2BIG            7
+#define ENOEXEC          8
+#define EBADF            9
+#define ECHILD          10
+#define EAGAIN          11
+#define ENOMEM          12
+#define EACCES          13
+#define EFAULT          14
+#define ENOTBLK         15
+#define EBUSY           16
+#define EEXIST          17
+#define EXDEV           18
+#define ENODEV          19
+#define ENOTDIR         20
+#define EISDIR          21
+#define EINVAL          22
+#define ENFILE          23
+#define EMFILE          24
+#define ENOTTY          25
+#define ETXTBSY         26
+#define EFBIG           27
+#define ENOSPC          28
+#define ESPIPE          29
+#define EROFS           30
+#define EMLINK          31
+#define EPIPE           32
+#define EDOM            33
+#define ERANGE          34
+#define ENOMSG          35
+#define EIDRM           36
+#define ECHRNG          37
+#define EL2NSYNC        38
+#define EL3HLT          39
+#define EL3RST          40
+#define ELNRNG          41
+#define EUNATCH         42
+#define ENOCSI          43
+#define EL2HLT          44
+#define EDEADLK         45
+#define ENOLCK          46
+#define EBADE           50
+#define EBADR           51
+#define EXFULL          52
+#define ENOANO          53
+#define EBADRQC         54
+#define EBADSLT         55
+#define EDEADLOCK       56
+#define EBFONT          59
+#define ENOSTR          60
+#define ENODATA         61
+#define ETIME           62
+#define ENOSR           63
+#define ENONET          64
+#define ENOPKG          65
+#define EREMOTE         66
+#define ENOLINK         67
+#define EADV            68
+#define ESRMNT          69
+#define ECOMM           70
+#define EPROTO          71
+#define EDOTDOT         73
+#define EMULTIHOP       74
+#define EBADMSG         77
+#define ENAMETOOLONG    78
+#define EOVERFLOW       79
+#define ENOTUNIQ        80
+#define EBADFD          81
+#define EREMCHG         82
+#define ELIBACC         83
+#define ELIBBAD         84
+#define ELIBSCN         85
+#define ELIBMAX         86
+#define ELIBEXEC        87
+#define EILSEQ          88
+#define ENOSYS          89
+#define ELOOP           90
+#define ERESTART        91
+#define ESTRPIPE        92
+#define ENOTEMPTY       93
+#define EUSERS          94
+#define ENOTSOCK        95
+#define EDESTADDRREQ    96
+#define EMSGSIZE        97
+#define EPROTOTYPE      98
+#define ENOPROTOOPT     99
+#define EPROTONOSUPPORT 120
+#define ESOCKTNOSUPPORT 121
+#define EOPNOTSUPP      122
+#define ENOTSUP         EOPNOTSUPP
+#define EPFNOSUPPORT    123
+#define EAFNOSUPPORT    124
+#define EADDRINUSE      125
+#define EADDRNOTAVAIL   126
+#define ENETDOWN        127
+#define ENETUNREACH     128
+#define ENETRESET       129
+#define ECONNABORTED    130
+#define ECONNRESET      131
+#define ENOBUFS         132
+#define EISCONN         133
+#define ENOTCONN        134
+#define EUCLEAN         135
+#define ENOTNAM         137
+#define ENAVAIL         138
+#define EISNAM          139
+#define EREMOTEIO       140
+#define ESHUTDOWN       143
+#define ETOOMANYREFS    144
+#define ETIMEDOUT       145
+#define ECONNREFUSED    146
+#define EHOSTDOWN       147
+#define EHOSTUNREACH    148
+#define EWOULDBLOCK     EAGAIN
+#define EALREADY        149
+#define EINPROGRESS     150
+#define ESTALE          151
+#define ECANCELED       158
+#define ENOMEDIUM       159
+#define EMEDIUMTYPE     160
+#define ENOKEY          161
+#define EKEYEXPIRED     162
+#define EKEYREVOKED     163
+#define EKEYREJECTED    164
+#define EOWNERDEAD      165
+#define ENOTRECOVERABLE 166
+#define ERFKILL         167
+#define EHWPOISON       168
+#define EDQUOT          1133