remove non-generic __WORDSIZE definition

7019fbe103 (sys/user.h: derive __WORDSIZE from __LONG_MAX) didn't
change i386 and m68k for seemingly no reason

arch/i386/bits/user.h

@@ -1,6 +1,3 @@
-#undef __WORDSIZE
-#define __WORDSIZE 32
-
 typedef struct user_fpregs_struct {
 	long cwd, swd, twd, fip, fcs, foo, fos, st_space[20];
 } elf_fpregset_t;

arch/m68k/bits/user.h

@@ -1,6 +1,3 @@
-#undef __WORDSIZE
-#define __WORDSIZE 32
-
 struct user_m68kfp_struct {
 	unsigned long fpregs[24], fpcntl[3];
 };