Fix typo s/AM_CLFAGS/AM_CFLAGS/ in sanlock link

(cherry picked from commit 7de158cf)

src/Makefile.am

@@ -1360,7 +1360,7 @@ lockdriverdir = $(libdir)/libvirt/lock-driver
 lockdriver_LTLIBRARIES = sanlock.la
 
 sanlock_la_SOURCES = $(LOCK_DRIVER_SANLOCK_SOURCES)
-sanlock_la_CFLAGS = $(AM_CLFAGS)
+sanlock_la_CFLAGS = $(AM_CFLAGS)
 sanlock_la_LDFLAGS = -module -avoid-version
 sanlock_la_LIBADD = -lsanlock_client \
 		../gnulib/lib/libgnu.la