Readd missing header

lib/libspl/Makefile.am

@@ -0,0 +1,14 @@
+include $(top_srcdir)/config/Rules.am
+
+DEFAULT_INCLUDES  = -I${libdir}/libspl/include
+
+lib_LTLIBRARIES = libspl.la
+
+libspl_la_SOURCES = list.c \
+                    mkdirp.c \
+                    strlcat.c \
+                    strlcpy.c \
+                    strnlen.c \
+                    u8_textprep.c \
+                    include/sys/list.h \
+                    include/sys/list_impl.h

lib/libzpool/kernel.c

@@ -30,6 +30,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <zlib.h>
+#include <sys/spa.h>
 #include <sys/stat.h>
 #include <sys/processor.h>
 #include <sys/zfs_context.h>