Remove cruft from fusl

fusl/arch/sh/src/__unmapself.c

-#include "pthread_impl.h"
-
-void __unmapself_sh_mmu(void *, size_t);
-void __unmapself_sh_nommu(void *, size_t);
-
-#if !defined(__SH3__) && !defined(__SH4__)
-#define __unmapself __unmapself_sh_nommu
-#include "dynlink.h"
-#undef CRTJMP
-#define CRTJMP(pc,sp) __asm__ __volatile__( \
-        "mov.l @%0+,r0 ; mov.l @%0,r12 ; jmp @r0 ; mov %1,r15" \
-        : : "r"(pc), "r"(sp) : "r0", "memory" )
-#include "../../../src/thread/__unmapself.c"
-#undef __unmapself
-extern __attribute__((__visibility__("hidden"))) unsigned __sh_nommu;
-#else
-#define __sh_nommu 0
-#endif
-
-void __unmapself(void *base, size_t size)
-{
-        if (__sh_nommu) __unmapself_sh_nommu(base, size);
-        else __unmapself_sh_mmu(base, size);
-}