tests: fix IPC test set

- use one single library instead of loose library files
- we don't have ftime() anymore
- shmat(non-NULL) is currently broken, fix shmt test set to bypass this
- some other small issues

test/ipc/Makefile

@@ -17,6 +17,7 @@
 #
 
 all test clean:
+	$(MAKE) -C ./lib $@
 #	$(MAKE) -C ./msgctl $@
 #	$(MAKE) -C ./msgget $@
 #	$(MAKE) -C ./msgrcv $@