Changes since previous version (20150901)
+ Apparently, OS X 10.4 does not have an implementation of le32dec().
Instead, unroll the inline function.
Bug report from Sevan - thanks!
latest 20130316 sources.
Changes since previous version:
+ this version is completely standalone, and relies on no external
libraries (other than libc)
+ updated man page to reflect reality
+ minor configure script added