Installation failure on OpenSUSE with OCaml 5.2

[shonfeder]

Reported also as a packaging issue at ocaml/opam-repository#26005

#=== ERROR while compiling bin_prot.v0.17.0 ===================================#
# context              2.2.0~beta3~dev | linux/x86_64 | ocaml-base-compiler.5.2.0 | file:///home/opam/opam-repository
# path                 ~/.opam/5.2/.opam-switch/build/bin_prot.v0.17.0
# command              ~/.opam/opam-init/hooks/sandbox.sh build dune build -p bin_prot -j 255
# exit-code            1
# env-file             ~/.opam/log/bin_prot-7-1d174a.env
# output-file          ~/.opam/log/bin_prot-7-1d174a.out
### output ###
# (cd _build/default/xen && /usr/bin/bash -e -u -o pipefail -c './cflags.sh > cflags.sexp')
# Package mirage-xen was not found in the pkg-config search path.
# Perhaps you should add the directory containing `mirage-xen.pc'
# to the PKG_CONFIG_PATH environment variable
# No package 'mirage-xen' found
# File "xen/dune", line 8, characters 0-215:
#  8 | (library
#  9 |  (foreign_stubs
# 10 |   (language c)
# 11 |   (flags
# 12 |    (:include cflags.sexp)))
# 13 |  (name bin_prot_xen)
# 14 |  (public_name bin_prot.xen)
# 15 |  (optional)
# 16 |  (virtual_deps mirage-xen-ocaml)
# 17 |  (libraries)
# 18 |  (preprocess no_preprocessing))
# (cd _build/default && /home/opam/.opam/5.2/bin/ocamlmklib -g -o xen/bin_prot_xen_stubs xen/blit_stubs.o)
# /usr/lib64/gcc/x86_64-suse-linux/7/../../../../x86_64-suse-linux/bin/ld: xen/blit_stubs.o: warning: relocation against `caml_leave_blocking_section' in read-only section `.text'
# /usr/lib64/gcc/x86_64-suse-linux/7/../../../../x86_64-suse-linux/bin/ld: xen/blit_stubs.o: relocation R_X86_64_PC32 against symbol `memcpy@@GLIBC_2.14' can not be used when making a shared object; recompile with -fPIC
# /usr/lib64/gcc/x86_64-suse-linux/7/../../../../x86_64-suse-linux/bin/ld: final link failed: bad value
# collect2: error: ld returned 1 exit status


<><> Error report <><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><>
+- The following actions failed
| - build bin_prot v0.17.0
+-

In there's not bandwidth to repair this, please note on the opam issue, and we can add an x-ci-accept-failures field on the package.

[Leonidas-from-XIV]

#27 might be able to fix the issue.