Revert "Add spinlock wrapper helpers"

This reverts commit 8b4a7c860d004ea8dffc11f6232124b574fe6cd7.
diff --git a/Makefile.solaris b/Makefile.solaris
index b8e75f8..fd1029b 100644
--- a/Makefile.solaris
+++ b/Makefile.solaris
@@ -3,7 +3,7 @@
 PROGS	= fio
 SCRIPTS = fio_generate_plots
 OBJS = gettime.o fio.o ioengines.o init.o stat.o log.o time.o filesetup.o \
-	eta.o verify.o memory.o io_u.o parse.o mutex.o spinlock.o options.o \
+	eta.o verify.o memory.o io_u.o parse.o mutex.o options.o \
 	rbtree.o fifo.o smalloc.o filehash.o lib/strsep.o
 
 OBJS += crc/crc7.o