compilers: Pass vs_module_defs with /DEF: to LLD-LINK

Recently, it is possible to install Clang with Visual Studio Installer. By
default this Clang has a MSVC target, and invokes the Microsoft Linker; if
`-fuse-ld=lld` is specified, it will invoke LLD-LINK. Both linkers take
MSVC-style arguments, and take DEF files with `/DEF:<path>`.

Previously DEF files were passed in the GNU way, directly on the linker
command line like an object file, which caused errors like

   lld-link: error: ..\my.def: unknown file type

While Clang-CL takes Unix-style options, it actually passes MSVC-style
options to LINK or LLD-LINK with `-Wl,`. There is already a check for both
linkers in `linker_to_compiler_args()`, so it's necessary to do the same
in `gen_vs_module_defs_args()`.

This commit closes #13988.

Signed-off-by: LIU Hao <lh_mouse@126.com>

mesonbuild/compilers/mixins/clang.py

@@ -135,7 +135,7 @@ def openmp_flags(self, env: Environment) -> T.List[str]:
             return []
 
     def gen_vs_module_defs_args(self, defsfile: str) -> T.List[str]:
-        if isinstance(self.linker, (MSVCDynamicLinker)):
+        if isinstance(self.linker, (ClangClDynamicLinker, MSVCDynamicLinker)):
             # With MSVC, DLLs only export symbols that are explicitly exported,
             # so if a module defs file is specified, we use that to export symbols
             return ['-Wl,/DEF:' + defsfile]