[POWERPC] include/asm-powerpc/: "extern inline" -> "static inline"

"extern inline" generates a warning with -Wmissing-prototypes and I'm
currently working on getting the kernel cleaned up for adding this to
the CFLAGS since it will help us to avoid a nasty class of runtime
errors.

If there are places that really need a forced inline, __always_inline
would be the correct solution.

Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Paul Mackerras <paulus@samba.org>

include/asm-powerpc/uaccess.h

@@ -304,7 +304,7 @@ extern unsigned long __copy_tofrom_user(void __user *to,
 
 #ifndef __powerpc64__
 
-extern inline unsigned long copy_from_user(void *to,
+static inline unsigned long copy_from_user(void *to,
 		const void __user *from, unsigned long n)
 {
 	unsigned long over;
@@ -319,7 +319,7 @@ extern inline unsigned long copy_from_user(void *to,
 	return n;
 }
 
-extern inline unsigned long copy_to_user(void __user *to,
+static inline unsigned long copy_to_user(void __user *to,
 		const void *from, unsigned long n)
 {
 	unsigned long over;