Don't use "mkdir" during install

lahwran just showed up on irc and told us that he installed znc, but znc failed
to find any modules. The reason for this was his umask 077 which means that
"make install" installed stuff so that only root can access it.

The solution is do use "install -d" since that makes sure to ignore the
currently set umask.

However, google finds results which say that "install -d" might mess with stuff
of pre-existing directories when it shouldn't, so we must first test if the
directory already exists before calling install. Obviously, this makes our
Makefile a lot more readable. :-(

I didn't have time to test this properly, so stuff might break.

Signed-off-by: Uli Schlachter <psychon@znc.in>

Makefile.in

@@ -103,11 +103,11 @@ src/%.o: src/%.cpp Makefile
 	$(Q)$(CXX) $(CXXFLAGS) -c -o $@ $< -MMD -MF .depend/$*.dep
 
 install: znc $(LIBZNC)
-	mkdir -p $(DESTDIR)$(bindir)
-	mkdir -p $(DESTDIR)$(includedir)/znc
-	mkdir -p $(DESTDIR)$(PKGCONFIGDIR)
-	mkdir -p $(DESTDIR)$(MODDIR)
-	mkdir -p $(DESTDIR)$(DATADIR)
+	test -d $(DESTDIR)$(bindir) || $(INSTALL) -d $(DESTDIR)$(bindir)
+	test -d $(DESTDIR)$(includedir)/znc || $(INSTALL) -d $(DESTDIR)$(includedir)/znc
+	test -d $(DESTDIR)$(PKGCONFIGDIR) || $(INSTALL) -d $(DESTDIR)$(PKGCONFIGDIR)
+	test -d $(DESTDIR)$(MODDIR) || $(INSTALL) -d $(DESTDIR)$(MODDIR)
+	test -d $(DESTDIR)$(DATADIR) || $(INSTALL) -d $(DESTDIR)$(DATADIR)
 	cp -R $(srcdir)/webskins $(DESTDIR)$(DATADIR)
 	find $(DESTDIR)$(DATADIR)/webskins -type d -exec chmod 0755 '{}' \;
 	find $(DESTDIR)$(DATADIR)/webskins -type f -exec chmod 0644 '{}' \;
@@ -119,7 +119,7 @@ install: znc $(LIBZNC)
 	$(INSTALL_DATA) znc.pc $(DESTDIR)$(PKGCONFIGDIR)
 	@$(MAKE) -C modules install DESTDIR=$(DESTDIR);
 	if test -n "$(LIBZNC)"; then \
-		mkdir -p $(DESTDIR)$(LIBZNCDIR) || exit 1 ; \
+		test -d $(DESTDIR)$(LIBZNCDIR) || $(INSTALL) -d $(DESTDIR)$(LIBZNCDIR) || exit 1 ; \
 		$(INSTALL_PROGRAM) $(LIBZNC) $(DESTDIR)$(LIBZNCDIR) || exit 1 ; \
 	fi
 	@$(MAKE) -C man install DESTDIR=$(DESTDIR)

man/Makefile.in

@@ -34,7 +34,7 @@ clean:
 	-rm -f $(MAN1)
 
 install: $(MAN1)
-	mkdir -p $(DESTDIR)$(mandir)/man1
+	test -d $(DESTDIR)$(mandir)/man1 || $(INSTALL) -d $(DESTDIR)$(mandir)/man1
 	$(INSTALL_DATA) $(MAN1) $(DESTDIR)$(mandir)/man1
 
 uninstall:

modules/Makefile.in

@@ -101,10 +101,9 @@ install: all install_datadir
 
 install_datadir:
 	rm -rf $(DESTDIR)$(DATADIR)/modules
-	mkdir -p $(DESTDIR)$(MODDIR)
-	mkdir -p $(DESTDIR)$(DATADIR)/modules
+	test -d $(DESTDIR)$(MODDIR) || $(INSTALL) -d $(DESTDIR)$(MODDIR)
+	test -d $(DESTDIR)$(DATADIR)/modules || $(INSTALL) -d $(DESTDIR)$(DATADIR)/modules
 	rm -rf $(DESTDIR)$(MODDIR)/*.so
-	mkdir -p $(DESTDIR)$(DATADIR)/modules
 	cp -R $(srcdir)/data/* $(DESTDIR)$(DATADIR)/modules
 	if test "@EXTRA@" = "yes" ; then \
 		cp -R $(srcdir)/extra/data/* $(DESTDIR)$(DATADIR)/modules ; \
@@ -116,8 +115,7 @@ clean:
 	rm -rf $(CLEAN)
 
 %.o: %.cpp Makefile
-	@mkdir -p .depend
-	@mkdir -p extra
+	@mkdir -p .depend extra
 	$(E) Building $(if $(filter %extra/,$(dir $<)),extra )module $(notdir $(basename $@))...
 	$(Q)$(CXX) $(MODFLAGS) -c -o $@ $< $($(notdir $(basename $@))CXXFLAGS) -MMD -MF .depend/$(notdir $@).dep