ppc64: fix compile error introduced in threaded coredump patch

arch/ppc64/boot/main.c

@@ -8,7 +8,6 @@
  * as published by the Free Software Foundation; either version
  * 2 of the License, or (at your option) any later version.
  */
-#define __KERNEL__
 #include "ppc32-types.h"
 #include "zlib.h"
 #include <linux/elf.h>
@@ -28,6 +27,10 @@ void flush_cache(void *, unsigned long);
 void pause(void);
 extern void exit(void);
 
+unsigned long strlen(const char *s);
+void *memmove(void *dest, const void *src, unsigned long n);
+void *memcpy(void *dest, const void *src, unsigned long n);
+
 static struct bi_record *make_bi_recs(unsigned long);
 
 #define RAM_START	0x00000000

include/asm-ppc64/elf.h

@@ -97,6 +97,8 @@ typedef elf_fpreg_t elf_fpregset_t[ELF_NFPREG];
 
 #define ELF_ET_DYN_BASE         (0x08000000)
 
+#ifdef __KERNEL__
+
 /* Common routine for both 32-bit and 64-bit processes */
 static inline void ppc64_elf_core_copy_regs(elf_gregset_t elf_regs,
 					    struct pt_regs *regs)
@@ -131,6 +133,8 @@ extern void dump_smp_unlazy_fpu(void);
 #define ELF_CORE_SYNC dump_smp_unlazy_fpu
 #endif
 
+#endif
+
 /* This yields a mask that user programs can use to figure out what
    instruction set this cpu supports.  This could be done in userspace,
    but it's not easy, and we've already done it here.  */