ci: Update dist-x86_64-netbsd to ubuntu:22.04

Author: cuviper

src/ci/docker/host-x86_64/dist-x86_64-netbsd/Dockerfile

@@ -1,14 +1,14 @@
-FROM ubuntu:20.04
+FROM ubuntu:22.04
 
+ARG DEBIAN_FRONTEND=noninteractive
 COPY scripts/cross-apt-packages.sh /scripts/
 RUN sh /scripts/cross-apt-packages.sh
-RUN DEBIAN_FRONTEND=noninteractive apt-get install -y zlib1g-dev
+RUN apt-get install -y zlib1g-dev
 
 COPY host-x86_64/dist-x86_64-netbsd/build-netbsd-toolchain.sh /tmp/
-RUN /tmp/build-netbsd-toolchain.sh
-
-COPY scripts/cmake.sh /scripts/
-RUN /scripts/cmake.sh
+# GCC 10 changed the default to -fno-common, which causes errors with the NetBSD-9.0 sources like:
+# /usr/bin/ld: buf.o:(.bss+0x0): multiple definition of `debug_file'; arch.o:(.bss+0x0): first defined here
+RUN env HOST_CFLAGS="-O -fcommon" /tmp/build-netbsd-toolchain.sh
 
 COPY scripts/sccache.sh /scripts/
 RUN sh /scripts/sccache.sh