Merge pull request #194298 from alyssais/netbsd-libc-fcommon

netbsd.libc: fix build

pkgs/os-specific/bsd/netbsd/default.nix

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       byacc genassym gencat lorder tsort statHook rsync rpcgen
     ];
     buildInputs = with self; [ headers csu ];
-    NIX_CFLAGS_COMPILE = "-B${self.csu}/lib";
+    NIX_CFLAGS_COMPILE = "-B${self.csu}/lib -fcommon";
     meta.platforms = lib.platforms.netbsd;
     SHLIBINSTALLDIR = "$(out)/lib";
     MKPICINSTALL = "yes";