Add reproduction test-case for dune#11012.

Signed-off-by: Rodolphe Lepigre <[email protected]>

test/blackbox-tests/test-cases/coq/plugin-deps.t/coqlib/dune-project

@@ -0,0 +1,3 @@
+(lang dune 3.8)
+(using coq 0.8)
+(name coqlib)

test/blackbox-tests/test-cases/coq/plugin-deps.t/coqlib/plugin/dune

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+(library
+ (name coqlib_plugin)
+ (public_name coqlib-plugin.plugin)
+ (libraries somelib))

test/blackbox-tests/test-cases/coq/plugin-deps.t/coqlib/theories/dune

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+(coq.theory
+ (name coqlib)
+ (package coqlib)
+ (plugins coqlib-plugin.plugin))
+
+;(rule
+; (targets dummy.v)
+; (deps (package coqlib-plugin))
+; (action (with-stdout-to %{targets} (echo "(* dummy file *)"))))

test/blackbox-tests/test-cases/coq/plugin-deps.t/coqlib/theories/plugin.v

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+Declare ML Module "coqlib-plugin.plugin".

test/blackbox-tests/test-cases/coq/plugin-deps.t/dune-workspace

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+(lang dune 3.8)

test/blackbox-tests/test-cases/coq/plugin-deps.t/run.t

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+The following should succeed.
+
+  $ dune build coqlib/theories/plugin.vo
+  Warning: Cannot open directory ../../somelib/src
+           [cannot-open-dir,filesystem,default]
+  File "./coqlib/theories/plugin.v", line 1, characters 0-41:
+  Error:
+  Dynlink error: error loading shared library: Dynlink.Error (Dynlink.Cannot_open_dll "Failure(\"$TESTCASE_ROOT/_build/install/default/lib/somelib/somelib.cmxs: cannot open shared object file: No such file or directory\")")
+
+  [1]

test/blackbox-tests/test-cases/coq/plugin-deps.t/somelib/dune-project

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+(lang dune 3.8)
+(name somelib)

test/blackbox-tests/test-cases/coq/plugin-deps.t/somelib/src/dune

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+(library
+ (public_name somelib))

test/blackbox-tests/test-cases/coq/plugin-deps.t/somelib/src/version.ml

@@ -0,0 +1 @@
+let version = "dev"