For different reasons some used functions aren't portable or simply are
not included in mingw. This includes index, rindex, strptime, and
timegm.
A workaround for this is needed, if we want to build for windows using
mingw based mxe environment. This patch does:
- drops index and rindex in favor of strchr and strrchr
- substitute strptime with a sscanf parsing
- emulate timegm with a private func smtk_timegm()
- remove definitions needed by strptime
Signed-off-by: Salvador Cuñat <salvador.cunat@gmail.com>
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