liquidwar5: add -fcommon workaround
Workaround build failure on -fno-common toolchains like upstreamgcc-10. Otherwise build fails as: ld: random.o:(.bss+0x0): multiple definition of `LW_RANDOM_ON'; game.o:(.bss+0x4): first defined here
Sergei Trofimovich 3 years ago d78f6771 6323f3cc