tests: add memory leak test

Also ...

tcctest.c:
- exclude stuff that gcc doesn't compile on windows.

libtcc.c/tccpp.c:
- use unsigned for memory sizes to avoid printf format warnings
- use "file:line: message" to make IDE error parsers happy.

tccgen.c: fix typo

tests/tests2/Makefile

@@ -63,7 +63,7 @@ all test: $(filter-out $(SKIP),$(TESTS))
 
 # automatically generate .expect files with gcc:
 %.expect : %.c
-	(gcc -w $*.c -o a.exe && ./a.exe $(ARGS)) >$*.expect 2>&1; rm -f a.exe
+	(gcc -w $*.c -o a.exe && ./a.exe $(ARGS)) $(FILTER) >$*.expect 2>&1; rm -f a.exe
 
 # tell make not to delete
 .PRECIOUS: %.expect