12312 fix unused lib dependencies

*** 19,28 ****
--- 19,29 ----
  # CDDL HEADER END
  #
  #
  # Copyright (c) 2009, 2010, Oracle and/or its affiliates. All rights reserved.
  # Copyright (c) 2016 by Delphix. All rights reserved.
+ # Copyright 2020 Joyent, Inc.
  #
  
  LIBRARY =       s10_brand.a
  VERS =          .1
  COBJS =         s10_brand.o s10_deleted.o s10_signal.o
*** 80,90 ****
  # Needed to handle zfs include files
  CSTD=   $(CSTD_GNU99)
  C99LMODE=       -Xc99=%all
  DYNFLAGS +=     $(DYNFLAGS_$(CLASS))
  DYNFLAGS +=     $(BLOCAL) $(ZNOVERSION) -Wl,-e_start
! LDLIBS +=       -lc -lmapmalloc
  LINTFLAGS +=    -erroff=E_STATIC_UNUSED
  LINTFLAGS64 +=  -erroff=E_STATIC_UNUSED
  
  CERRWARN +=     $(CNOWARN_UNINIT)
  
--- 81,91 ----
  # Needed to handle zfs include files
  CSTD=   $(CSTD_GNU99)
  C99LMODE=       -Xc99=%all
  DYNFLAGS +=     $(DYNFLAGS_$(CLASS))
  DYNFLAGS +=     $(BLOCAL) $(ZNOVERSION) -Wl,-e_start
! LDLIBS +=       -lmapmalloc -lc
  LINTFLAGS +=    -erroff=E_STATIC_UNUSED
  LINTFLAGS64 +=  -erroff=E_STATIC_UNUSED
  
  CERRWARN +=     $(CNOWARN_UNINIT)
  
*** 92,99 ****
  
  .KEEP_STATE:
  
  all: $(LIBS)
  
- lint: lintcheck
- 
  include $(SRC)/lib/Makefile.targ
--- 93,98 ----