[fusl] Remove code for unsupported architectures

fusl/src/string/arm/__aeabi_memcpy.c

Index: fusl/src/string/arm/__aeabi_memcpy.c
diff --git a/fusl/src/string/arm/__aeabi_memcpy.c b/fusl/src/string/arm/__aeabi_memcpy.c
deleted file mode 100644
index 2aa50eaf7cc9634964a4c5d13d33ea6eb9639aa3..0000000000000000000000000000000000000000
--- a/fusl/src/string/arm/__aeabi_memcpy.c
+++ /dev/null
@@ -1,8 +0,0 @@
-#include <string.h>
-#include "libc.h"
-
-void __aeabi_memcpy(void* restrict dest, const void* restrict src, size_t n) {
-  memcpy(dest, src, n);
-}
-weak_alias(__aeabi_memcpy, __aeabi_memcpy4);
-weak_alias(__aeabi_memcpy, __aeabi_memcpy8);