squeak: add -fcommon workaround

Workaround build failure on -fno-common toolchains like upstream
gcc-10. Otherwise build fails as:

ld: vm/vm.a(cogit.o):spur64src/vm/cogitX64SysV.c:2552: multiple definition of
`traceStores'; vm/vm.a(gcc3x-cointerp.o):spur64src/vm/cogit.h:140: first defined here

authored by Sergei Trofimovich and committed by ehmry 8bc1f617 a58de450

+5
+5
pkgs/development/compilers/squeak/default.nix
··· 136 136 --replace '/bin/rm ' '${coreutils}/bin/rm ' 137 137 ''; 138 138 139 + # Workaround build failure on -fno-common toolchains: 140 + # ld: vm/vm.a(cogit.o):spur64src/vm/cogitX64SysV.c:2552: multiple definition of 141 + # `traceStores'; vm/vm.a(gcc3x-cointerp.o):spur64src/vm/cogit.h:140: first defined here 142 + NIX_CFLAGS_COMPILE = "-fcommon"; 143 + 139 144 preAutoreconf = '' 140 145 pushd ./platforms/unix/config > /dev/null 141 146 ./mkacinc > ./acplugins.m4