Don't export strlen twice

Fix 
WARNING: vmlinux: 'strlen' exported twice. Previous export was in vmlinux

Reported by Mats Johannesson

Signed-off-by: Andi Kleen <ak@suse.de>

---
 arch/x86_64/kernel/x8664_ksyms.c |    2 --
 1 files changed, 2 deletions(-)

Index: linux/arch/x86_64/kernel/x8664_ksyms.c
===================================================================
--- linux.orig/arch/x86_64/kernel/x8664_ksyms.c
+++ linux/arch/x86_64/kernel/x8664_ksyms.c
@@ -112,7 +112,6 @@ EXPORT_SYMBOL_GPL(unset_nmi_callback);
 #undef memcpy
 #undef memset
 #undef memmove
-#undef strlen
 
 extern void * memset(void *,int,__kernel_size_t);
 extern size_t strlen(const char *);
@@ -121,7 +120,6 @@ extern void * memcpy(void *,const void *
 extern void * __memcpy(void *,const void *,__kernel_size_t);
 
 EXPORT_SYMBOL(memset);
-EXPORT_SYMBOL(strlen);
 EXPORT_SYMBOL(strpbrk);
 EXPORT_SYMBOL(memmove);
 EXPORT_SYMBOL(memcpy);