docker: add binutils-dev for x86_64 objtool build #232
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docker: iadd binutils-dev for x86_64 objtool build
Recent kernel changes (commit 59953303827e "objtool: Disassemble code
with libopcodes instead of running objdump") require libopcodes for
x86_64 builds. The kernel's objtool Makefile detects libbfd and enables
disassembly support, which then requires libopcodes at link time.
Since libbinutils (which provides libbfd) is already installed in
Dockerfile.build, the build system enables BUILD_DISAS=y but fails to
link because libopcodes (from binutils-dev) was missing for native
builds.
Add binutils-dev to the base image to provide libopcodes for all builds.
Cross-compilation scenarios continue to work via the existing
binutils-dev:${arch} handling in Dockerfile.build.
Closes: #230