bootstrap.ci: flexibilize option -R
bootstrap.ci: flexibilize option -R

When -R is given, accept indication of -rc resp. ~rc version
strings in git describe's output.

philipWendland/OpenSC,Jakuje/OpenSC,hongquan/OpenSC-main,rickyepoderi/OpenSC,metsma/OpenSC,mouse07410/OpenSC,philipWendland/OpenSC,hhonkanen/OpenSC,rickyepoderi/OpenSC,OpenSC/OpenSC,fabled/OpenSC,CardContact/OpenSC,hhonkanen/OpenSC,OpenSC/OpenSC,AktivCo/OpenSC,hhonkanen/OpenSC,Jakuje/OpenSC,AktivCo/OpenSC,dengert/OpenSC,mouse07410/OpenSC,metsma/OpenSC,rickyepoderi/OpenSC,AktivCo/OpenSC,Jakuje/OpenSC,fabled/OpenSC,LudovicRousseau/OpenSC,viktorTarasov/OpenSC-SM,mouse07410/OpenSC,frankmorgner/OpenSC,frankmorgner/OpenSC,LudovicRousseau/OpenSC,philipWendland/OpenSC,viktorTarasov/OpenSC-SM,Jakuje/OpenSC,OpenSC/OpenSC,fabled/OpenSC,fabled/OpenSC,CardContact/OpenSC,frankmorgner/OpenSC,viktorTarasov/OpenSC-SM,CardContact/OpenSC,frankmorgner/OpenSC,hongquan/OpenSC-main,hongquan/OpenSC-main,dengert/OpenSC,metsma/OpenSC,dengert/OpenSC,LudovicRousseau/OpenSC