Connected the log file facility to stderr

ice40/main.cc

@@ -25,6 +25,7 @@
 #include "mainwindow.h"
 #include "pybindings.h"
 #include "version.h"
+#include "log.h"
 
 void svg_dump_el(const GraphicElement &el)
 {
@@ -52,6 +53,8 @@ int main(int argc, char *argv[])
     int rc = 0;
     std::string str;
 
+    log_files.push_back(stderr);
+
     po::options_description options("Allowed options");
     options.add_options()("help,h", "show help");
     options.add_options()("test", "just a check");