12312 fix unused lib dependencies

@@ -21,11 +21,11 @@
 #
 #
 # Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
 # Use is subject to license terms.
 #
-# Copyright (c) 2018, Joyent, Inc.
+# Copyright 2020 Joyent, Inc.
 
 include         ../Makefile.cmd
 
 PROG =          oawk
 LINKPROG =      awk

@@ -56,11 +56,10 @@
 CLEANFILES =    proctab.c y.tab.h y.tab.c awk.h awk.g.c         \
                 tmptoken.c awk.lx.c $(NATIVEOBJS) $(MAKEPRCTAB) \
                 temp
 
 YFLAGS =        -d
-XLDLIBS5CC +=   -lm
 LDLIBS +=       -lm
 CPPFLAGS =      -I. $(CPPFLAGS.master)
 CPPFLAGS +=     -D_FILE_OFFSET_BITS=64
 
 ROOTLINK =      $(LINKPROG:%=$(ROOTBIN)/%)