Makefile: fix check-libroach with linux release toolchain #26298
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The Linux release toolchain uses an ancient version of glibc that
requires linking against -lrt. Teach CMake to link test binaries
accordingly on Linux.
The Linux release toolchain also uses a very recent version of libstdc++
that must be statically linked. Plumb the link flags down into CMake via
the LDFLAGS variable. (Previously they were only passed down to links
invoked by Go via the -extldflags flag in the LINKFLAGS variable.)
Release note: None