missing this symbol caused a library to not load. implementation taken from old/compat/libnet/netconfig.c, after removing printf.

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@24301 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/kits/network/r5_compatibility.cpp

@@ -30,6 +30,7 @@ extern "C" {
 		const char* name, const char* value);
 	int getusername(char *user, size_t bufferLength);
 	int getpassword(char *password, size_t bufferLength);
+	char *_netconfig_find(const char *heaading, const char *name, char *value, int nbytes);
 }
 
 
@@ -118,3 +119,9 @@ getpassword(char *password, size_t length)
 
 	return strlen(password);
 }
+
+char *
+_netconfig_find(const char *heading, const char *name, char *value, int nbytes)
+{
+	return find_net_setting(NULL, heading, name, value, nbytes);
+}