Yet another attempt to use CMake

src/znc.cpp

@@ -159,6 +159,12 @@ CString CZNC::GetCompileOptionsString() {
            "yes"
 #else
            "no"
+#endif
+		   ", build: "
+#ifdef BUILD_WITH_CMAKE
+		   "cmake"
+#else
+		   "autoconf"
 #endif
         ;
 }