tdf#82430: gcc-wrappers: command line *must* start with a space

Yes, you read that right, if there's no space in front of the first
argument, cl.exe will *ignore* it.

Change-Id: I73d9bf026705538e53b5d91091a4c96eb15739b2

solenv/gcc-wrappers/wrapper.cxx

@@ -186,6 +186,11 @@ int startprocess(string command, string args) {
         command=command.substr(0,pos+strlen("ccache"))+".exe";
     }
 
+    if (args[0] != ' ')
+    {
+        args.insert(0, " "); // lpCommandLine *must* start with space!
+    }
+
     //cerr << "CMD= " << command << " " << args << endl;
 
     // Commandline may be modified by CreateProcess