Add work-around for powerpc.

Do noy use syscall wrapper based on INTERNAL_SYSCALL.
A proper fix would require an arch specific implementation.

Signed-off-by: Carmelo Amoroso <carmelo.amoroso@st.com>

libc/sysdeps/linux/common/posix_fadvise64.c

@@ -25,7 +25,7 @@
 
 #define __NR_posix_fadvise64 __NR_fadvise64_64
 
-#ifdef INTERNAL_SYSCALL
+#if defined INTERNAL_SYSCALL && ! defined __TARGET_powerpc__
 int posix_fadvise64(int fd, __off64_t offset, __off64_t len, int advice)
 {
   if (len != (off_t) len)
@@ -56,7 +56,7 @@ int posix_fadvise64(int fd, __off64_t offset, __off64_t len, int advice)
 /* 32 bit implementation is kind of a pita */
 #elif __WORDSIZE == 32
 
-#ifdef INTERNAL_SYSCALL
+#if defined INTERNAL_SYSCALL && ! defined __TARGET_powerpc__
 int posix_fadvise64(int fd, __off64_t offset, __off64_t len, int advice)
 {
 	INTERNAL_SYSCALL_DECL (err);