cmd/link: panic on riscv64 with CGO enabled due to empty container symbol [1.24 backport]

[gopherbot]

@mengzhuo requested issue #72840 to be considered for backport to the next 1.24 minor release.

@gopherbot Please open a backport issue for Go 1.24.

[mrkfrmn]

@mengzhuo can you please provide a rationale for a backport into 1.24? It looks like it was fixed back in April for 1.25.

[yuzibo]

Unfortunately, now Debian golang is golang-1.24 and gcc-15 on unstable meanwhile, this causes some go packages to have build issues.

[mengzhuo]

Some Linux distro using old 1.24 (Debian for example as yuzibo says) @mrkfrmn

[mknyszek]

@yuzibo and @mengzhuo thanks for the context. Since it's a simple fix and it's causing downstream build issues without an obvious workaround, the cherry pick is approved.

[gopherbot]

Change https://go.dev/cl/704775 mentions this issue: [release-branch.go1.24] cmd/link: fix cgo on riscv64 when building with gcc-15