- updated the makefiles and code to allow compliation with MinGW once again (some of patch #875485 by perditionc)

- fixed errors and warnings given by gcc


git-svn-id: https://svn.code.sf.net/p/nsis/code/NSIS/trunk@3513 212acab6-be3b-0410-9dea-997c60f758d6

Source/makenssi.cpp

@@ -82,7 +82,6 @@ int main(int argc, char **argv)
   int nousage=0;
   int files_processed=0;
   int cmds_processed=0;
-  int plugins_processed=0;
   FILE *fp;
   int tmpargpos=1;
   int no_logo=0;