Update Makefile

Author: vmcj

doc/Makefile

@@ -9,6 +9,7 @@ include $(TOPDIR)/Makefile.global
 # Subdirectories to recurse into for REC_TARGETS
 SUBDIRS = manual examples
 inplace-install inplace-uninstall: SUBDIRS=manual
+distclean: SUBDIRS=examples
 
 install-docs-l:
 	$(INSTALL_DATA) -t $(DESTDIR)$(domjudge_docdir)/logos logos/DOMjudgelogo.pdf