change argument type in madvise

Make madvise prototype the same as linux man page.

Bug: 18539500
Change-Id: If3fd0e1d9539b9e10531ab9087bc4040e32b6e9b
diff --git a/libc/SYSCALLS.TXT b/libc/SYSCALLS.TXT
index 39ff37d..d9ede2f 100644
--- a/libc/SYSCALLS.TXT
+++ b/libc/SYSCALLS.TXT
@@ -101,7 +101,7 @@
 void*       mremap(void*, size_t, size_t, unsigned long)  all
 int         msync(const void*, size_t, int)    all
 int         mprotect(const void*, size_t, int)  all
-int         madvise(const void*, size_t, int)  all
+int         madvise(void*, size_t, int)  all
 int         mlock(const void* addr, size_t len)    all
 int         munlock(const void* addr, size_t len)   all
 int         mlockall(int flags)   all