reactos.cab should not contain duplicate filenames

I assume all filenames should be distinct.

–

reactos-bootcd-0.4.8-dev-391-g197ec4c-x86-gcc-lin-dbg.7z
Already had (some of) the following duplicates.

reactos-bootcdregtest-0.4.9-dev-35-g21ae3a0-x86-gcc-lin-dbg.iso
Duplicate names/files:
3 comctl32.dll
4 fusion.dll
2 gdiplus.dll
2 ntdll_apitest.exe
2 shell32.dll
2 test.ttf
2 test.otf
readme.txt + ReadMe.txt + README.txt
2 test.dll
2 test.pfb
2 test.pfm
2 AUTOEXEC.NT
2 CONFIG.NT