rtld-elf: Delete unused RELOC_ALIGNED_P copies

This was copied from arm to aarch64 to riscv, but only arm uses it.

MFC after:	1 week

libexec/rtld-elf/aarch64/reloc.c

@@ -36,13 +36,6 @@
 #include "rtld.h"
 #include "rtld_printf.h"
 
-/*
- * It is possible for the compiler to emit relocations for unaligned data.
- * We handle this situation with these inlines.
- */
-#define	RELOC_ALIGNED_P(x) \
-	(((uintptr_t)(x) & (sizeof(void *) - 1)) == 0)
-
 /*
  * This is not the correct prototype, but we only need it for
  * a function pointer to a simple asm function.

libexec/rtld-elf/riscv/reloc.c

@@ -40,13 +40,6 @@
 #include "rtld.h"
 #include "rtld_printf.h"
 
-/*
- * It is possible for the compiler to emit relocations for unaligned data.
- * We handle this situation with these inlines.
- */
-#define	RELOC_ALIGNED_P(x) \
-	(((uintptr_t)(x) & (sizeof(void *) - 1)) == 0)
-
 uint64_t
 set_gp(Obj_Entry *obj)
 {