merged signal.c in timer.c

Makefile

@@ -33,7 +33,7 @@ TIME := \time -f "\ttime: %E real, %U user, %S sys\n\tcontext-switch:\t%c+%w, pa
 export PATH := .:$(PATH)
 
 TARGETS=lceb tree oper timer
-OBJS=lceb.o tree.o oper.o stack.o eval.o best.o timer.o stack.o signal.o
+OBJS=lceb.o tree.o oper.o stack.o eval.o best.o timer.o stack.o
 INCLUDES=lceb.h
 DEPS=$(INCLUDES) Makefile