Issues handling libraries during Windows build

[Adrian Pop]

Sometimes the windows builds fail on target 'libs-for-testing'.
We should investigate more.

Sometimes omc crashes:

../../build/bin/omc index.mos
true
true
"C:/dev/jenkins/ws/Windows/OM_Win/testsuite/libraries-for-testing"
""
true
"C:/dev/jenkins/ws/Windows/OM_Win/testsuite/libraries-for-testing/.openmodelica/libraries/"

Makefile:11: recipe for target '.openmodelica/libraries/20200610130629.stamp' failed
make[1]: *** [.openmodelica/libraries/20200610130629.stamp] Segmentation fault

Sometimes fetching some library via omc fails:

BioChem 1.0.1+msl.3.2.1 failed
Error: Curl error for URL https://github.com/OpenModelica/OpenModelica-ModelicaStandardLibrary/archive/06af0578789283267a4089fffd8f2fb302e0405a.zip: Failure when receiving data from the peer

Makefile:11: recipe for target '.openmodelica/libraries/20200610130629.stamp' failed
make[1]: *** [.openmodelica/libraries/20200610130629.stamp] Error 1

[Francesco Casella]

Milestone future actually means never...

[Adrian Pop]

PR: ​https://github.com/OpenModelica/OpenModelica/pull/6943
will show the statements executed so I can (hopefully) find out where it dies.

[Adrian Pop]

This doesn't seem to happen anymore with clang builds or the newer gcc.
Will reopen if it shows up again.