Update innoextract to 1.6.

innoextract 1.6 (2016-03-24)
- Added support for Inno Setup 5.5.7 (and 5.5.8) installers
- Added a --collisions=rename-all option
- Changed --collisions=rename to omit the suffix for the file that would have been extracted with --collisions=overwrite instead of the first encountered file
- Fixed @lang suffix sometimes missing for the first file with the --collisions=rename option
- Fixed build error with CMake 3.5
- Now compiles in C++14 mode if supported
- Unsafe characters in special constant strings (ie ':' in {code:…}) are now replaced with '$'
- Windows: Fixed error message if the source file could not be opened
- Windows: Fixed progress bar flickering while printing extracted filenames
- Windows binaries: Fixed crash on platforms without AVX support

(wiz)