Fix the Makefile's dependency tracking

Turns out that .depend's mtime changes when you modify files in there
and since every .cpp file depended on .depend, make regenerated everything.
Not good.

Fix this by inlining the mkdir for .depend.


git-svn-id: https://znc.svn.sourceforge.net/svnroot/znc/trunk@1027 726aef4b-f618-498e-8847-2d620e286838

modules/Makefile.in

@@ -47,15 +47,10 @@ TARGETS  := $(addsuffix .so, $(FILES))
 
 CLEAN    := *.so
 
-.PHONY: all clean depend install modperl_install
+.PHONY: all clean install modperl_install
 
 all: $(TARGETS)
 
-.depend:
-	@mkdir -p .depend
-
-depend: .depend
-
 install: all create_install_dir install_metadirs $(PERLHOOK)
 	install -m 0755 $(TARGETS) $(DESTDIR)$(MODDIR)
 
@@ -74,7 +69,8 @@ install_metadirs: create_install_dir
 clean:
 	rm -rf $(CLEAN)
 
-%.so: %.cpp .depend
+%.so: %.cpp
+	@mkdir -p .depend
 	$(CXX) $(MODFLAGS) $(INCLUDES) $(LDFLAGS) -shared -o $@ $< $($(basename $<)FLAGS) -MMD -MF .depend/$<.dep
 
 modperl_install: create_install_dir