Fixed MinGW (GCC 4.5.2)


git-svn-id: http://svn.code.sf.net/p/nsis/code/NSIS@6530 212acab6-be3b-0410-9dea-997c60f758d6
Remove pluginapi.c's dependency on nsis_tchar.h


git-svn-id: http://svn.code.sf.net/p/nsis/code/NSIS@6531 212acab6-be3b-0410-9dea-997c60f758d6
Print gcc & g++ version when using the gnu config


git-svn-id: http://svn.code.sf.net/p/nsis/code/NSIS@6532 212acab6-be3b-0410-9dea-997c60f758d6