3442 sgs checks should be run in normal builds

*** 134,143 ****
--- 134,145 ----
  $(MSGDIR):      $(MSGSUBDIRS) FRC
                  @ cd $@; pwd; $(MAKE) $(TARGET)
  
  chkmsg:         libconv $(MSGSUBDIRS) FRC
  
+ check:          chkmsg
+ 
  # built from lib/Makefile
  install_lib:    FRC
                  @ cd lex; pwd; $(MAKE) $@
                  @ cd yacc; pwd; $(MAKE) $@