interpreter/type_checking: fix link_with and link_whole with empty string values

This was reported as breaking pandas. Just like the `link_args`
behavior, this wasn't intended, but is a result of a leaky Python
abstraction ('' is falsy, and thus being caught in a falsy comparison,
such as `if not value: ...`).

This marks link_with and link_whole as being broken in the same way. I
have only marked this for build_targets, as I don't think it applies
elsewhere.

Author: dcbaker

mesonbuild/interpreter/type_checking.py

@@ -473,7 +473,7 @@ def link_whole_validator(values: T.List[T.Union[StaticLibrary, CustomTarget, Cus
     listify=True,
     default=[],
     validator=link_whole_validator,
-    extra_types={Dependency: lambda _: _LINK_WITH_ERROR}
+    extra_types={Dependency: lambda _: _LINK_WITH_ERROR},
 )
 
 DEPENDENCY_SOURCES_KW: KwargInfo[T.List[T.Union[str, File, GeneratedTypes]]] = KwargInfo(
@@ -748,8 +748,12 @@ def _pch_convertor(args: T.List[str]) -> T.Optional[T.Tuple[str, T.Optional[str]
     DEPENDENCIES_KW,
     INCLUDE_DIRECTORIES.evolve(name='d_import_dirs'),
     LINK_ARGS_KW,
-    LINK_WHOLE_KW,
-    LINK_WITH_KW,
+    LINK_WHOLE_KW.evolve(
+        as_default={'': ('1.11.0', "Replace an empty string with an empty array: `link_whole : ''` -> `link_whole : []`")},
+    ),
+    LINK_WITH_KW.evolve(
+        as_default={'': ('1.11.0', "Replace an empty string with an empty array: `link_with : ''` -> `link_with : []`")},
+    ),
     _NAME_PREFIX_KW,
     _NAME_PREFIX_KW.evolve(name='name_suffix', validator=_name_suffix_validator),
     RUST_CRATE_TYPE_KW,