fixed build with OpenBSD

DaemonLinux.cpp

@@ -75,10 +75,12 @@ namespace i2p
 					return false;
 				}
 
+#if !defined(__OpenBSD__)
 				// point std{in,out,err} descriptors to /dev/null
                 stdin  = freopen("/dev/null", "r", stdin);
 				stdout = freopen("/dev/null", "w", stdout);
 				stderr = freopen("/dev/null", "w", stderr);
+#endif
 			}
 
 			// Pidfile

Makefile

@@ -21,7 +21,7 @@ ifeq ($(UNAME),Darwin)
 	else
 		include Makefile.osx
 	endif
-else ifeq ($(shell echo $(UNAME) | $(GREP) -c FreeBSD),1)
+else ifeq ($(shell echo $(UNAME) | $(GREP) -Ec '(Free|Open)BSD'),1)
 	DAEMON_SRC += DaemonLinux.cpp
 	include Makefile.bsd
 else ifeq ($(UNAME),Linux)