fwtool: update to latest Git head

fwtool: update to latest Git head

Includes following changes:

 9d9d4c284786 fix possible garbage in unitialized char* struct members
 dbc1b1b71b24 fix possible copy of null buffer and validation of unitialized header
 76d53deef8bb crc32: add missing stdint.h dependency
 e5666ed3b47c add cram based unit tests
 abe0cf7de053 add initial GitLab CI support
 e43042507b4f iron out extra compiler warnings
 5df0cd6e1523 convert into CMake project
 a7dc0526f819 refactor into separate Git project

adds missing PKG_LICENSE field and converts the package build to utilize
CMake.

Signed-off-by: Petr Štetiar <ynezz@true.cz>