make tre compile on windows 64-bit
make gt_file_find_exec_in_path() work on Windows
Merge pull request #133 from gordon/tre

make tre compile on windows 64-bit
get rid of compiler warning (uninitialized value)
Merge pull request #134 from gordon/windows

make gt_file_find_exec_in_path() work on Windows
fix memory leak
Merge pull request #136 from satta/memleak_fix

fix memory leak
Merge pull request #135 from gordon/multieop

get rid of compiler warning (uninitialized value)