Remove segment extraction from cmake

[fpedd]

This removes clutter in the binary directory when building with vector extension support.

[wysiwyng]

A fix like this was already merged into ETISS a while ago: https://github.com/tum-ei-eda/etiss/blob/master/examples/SW/riscv/cmake/PulpinoTarget.cmake
Your source branch is far behind the current master, please check that first.

[fpedd]

The ml_on_mcu however still uses the v-ext-support branch until I get the vector stuff working on the master branch (which I don't know how long it will take. I would really like to first test the vector instruction from my PR #76 before merging them).

PS: the windows build only fails because the compiler runs out of memory: D:\a\etiss\etiss\ArchImpl\RISCV\RISCVArch.cpp(44454,1): fatal error C1060: compiler is out of heap space [D:\a\etiss\build\ArchImpl\RISCV\RISCV.vcxproj] (line 161 in the buildlog)

[rafzi]

Since you are actively working on this feature, feel free to directly push to this branch if you need further backports.

[fpedd]

@rafzi thank you