chore(mesh): delete unused gmsh_jll wrapper stub

Remove the optional Gmsh API wrapper that never shipped from the package entry
manifest.

- Drop `src/mesh/gmsh_wrapper.jl`.

src/mesh/gmsh_wrapper.jl

@@ -1,56 +0,0 @@
-# This file is a part of JuliaFEM.
-# License is MIT: see https://github.com/JuliaFEM/Gmsh.jl/blob/master/LICENSE
-#
-# Gmsh wrapper - consolidated from Gmsh.jl
-# Provides convenient access to Gmsh API via gmsh_jll
-
-import gmsh_jll
-include(gmsh_jll.gmsh_api)
-import .gmsh
-
-"""
-    gmsh_initialize(argv=String[]; finalize_atexit=true)
-
-Wrapper around `gmsh.initialize` which make sure to only call it if `gmsh` is not already
-initialized. Return `true` if `gmsh.initialize` was called, and `false` if `gmsh` was
-already initialized.
-
-The argument vector `argv` is passed to `gmsh.initialize`. `argv` can be used to pass
-command line options to Gmsh, see [Gmsh documentation for more
-details](https://gmsh.info/doc/texinfo/gmsh.html#index-Command_002dline-options). Note that
-this wrapper prepends the program name to `argv` since Gmsh expects that to be the first
-entry.
-
-If `finalize_atexit` is `true` a Julia exit hook is added, which calls `finalize()`.
-
-**Example**
-```julia
-Gmsh.initialize(["-v", "0"]) # initialize with decreased verbosity
-```
-"""
-function gmsh_initialize(argv=String[]; finalize_atexit=true)
-    if Bool(gmsh.isInitialized())
-        return false
-    end
-    # Prepend a dummy program name in case argv only contains options
-    # see https://gitlab.onelab.info/gmsh/gmsh/-/issues/2112
-    if length(argv) > 0 && startswith(first(argv), "-")
-        argv = pushfirst!(copy(argv), "gmsh")
-    end
-    gmsh.initialize(argv)
-    if finalize_atexit
-        atexit(finalize)
-    end
-    return true
-end
-
-"""
-    Gmsh.finalize()
-
-Wrapper around `gmsh.finalize` which make sure to only call it if `gmsh` is initialized.
-"""
-function gmsh_finalize()
-    if Bool(gmsh.isInitialized())
-        gmsh.finalize()
-    end
-end