Makefile: Make "make test" depend on the main program.

Otherwise, running "make test" can run an old version of the code,
(even when new changes are sitting in the source waiting to be
compiled).

Makefile

@@ -17,7 +17,7 @@ glcpp: glcpp.o glcpp-lex.o glcpp-parse.o hash_table.o xtalloc.o
 
 glcpp-lex.c: glcpp-parse.h
 
-test:
+test: glcpp
 	@(cd tests; ./glcpp-test)
 
 clean: