[fusl] Remove code for unsupported architectures

fusl/arch/mips/pthread_arch.h

Index: fusl/arch/mips/pthread_arch.h
diff --git a/fusl/arch/mips/pthread_arch.h b/fusl/arch/mips/pthread_arch.h
deleted file mode 100644
index fdd59267fbbf60bed98cce190202cb2d464d4584..0000000000000000000000000000000000000000
--- a/fusl/arch/mips/pthread_arch.h
+++ /dev/null
@@ -1,18 +0,0 @@
-static inline struct pthread* __pthread_self() {
-#ifdef __clang__
-  char* tp;
-  __asm__ __volatile__(".word 0x7c03e83b ; move %0, $3" : "=r"(tp) : : "$3");
-#else
-  register char* tp __asm__("$3");
-  /* rdhwr $3,$29 */
-  __asm__ __volatile__(".word 0x7c03e83b" : "=r"(tp));
-#endif
-  return (pthread_t)(tp - 0x7000 - sizeof(struct pthread));
-}
-
-#define TLS_ABOVE_TP
-#define TP_ADJ(p) ((char*)(p) + sizeof(struct pthread) + 0x7000)
-
-#define DTP_OFFSET 0x8000
-
-#define MC_PC pc