First step at speeding up io_u rand refill

Makes it 3x faster here.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/Makefile.solaris b/Makefile.solaris
index 0ec6d73..49a4ef9 100644
--- a/Makefile.solaris
+++ b/Makefile.solaris
@@ -7,6 +7,8 @@
 	rbtree.o fifo.o smalloc.o filehash.o lib/strsep.o helpers.o solaris.o \
 	profile.o debug.o
 
+OBJS += lib/rand.o
+
 OBJS += crc/crc7.o
 OBJS += crc/crc16.o
 OBJS += crc/crc32.o