Make lib/raid6/test build correctly.

Some bit-rot needs to be cleaned out.

Signed-off-by: NeilBrown <[e-mail]>

include/linux/raid/pq.h

···
 #define disable_kernel_altivec()
 
 #define EXPORT_SYMBOL(sym)
+#define EXPORT_SYMBOL_GPL(sym)
 #define MODULE_LICENSE(licence)
+#define MODULE_DESCRIPTION(desc)
 #define subsys_initcall(x)
 #define module_exit(x)
 #endif /* __KERNEL__ */

lib/raid6/algos.c

···
  */
 
 #include <linux/raid/pq.h>
-#include <linux/gfp.h>
 #ifndef __KERNEL__
 #include <sys/mman.h>
 #include <stdio.h>
 #else
+#include <linux/gfp.h>
 #if !RAID6_USE_EMPTY_ZERO_PAGE
 /* In .bss so it's zeroed */
 const char raid6_empty_zero_page[PAGE_SIZE] __attribute__((aligned(256)));