Bug#966108: genesisplusgx: FTBFS with GCC 10: multiple definition of ... due to -fno-common

[Tobias Frost]

Control: fixed -1 1.7.4+git20160410-3
Control: tags -1 +pending 

Fixed in the VCS: https://salsa.debian.org/games-team/genesisplusgx

(Uploaded already, but unsure if the buildds will pick it up yet)