Fix #624: Can´t rename network via webinterface

The build output with apple's clang is a mess. Easy to miss real warnings with all this noise :(

	Building core object Modules...
	clang: warning: argument unused during compilation: '-I ./include'
	clang: warning: argument unused during compilation: '-I include'
	clang: warning: argument unused during compilation: '-I /opt/local/include'
	clang: warning: argument unused during compilation: '-I /opt/local/include'
	clang: warning: argument unused during compilation: '-include znc/zncconfig.h'
	src/Modules.cpp:236:1: warning: control may reach end of non-void function [-Wreturn-type]
	}
	^
	1 warning generated.