meson: Prelink links to avoid missing C++ initializers

This is the same as what the old build system did in
7eca8a16ea, done for the same reasons.

src/libexpr-c/meson.build

@@ -80,6 +80,7 @@ this_library = library(
   dependencies : deps_public + deps_private + deps_other,
   include_directories : include_dirs,
   link_args: linker_export_flags,
+  prelink : true, # For C++ static initializers
   install : true,
 )