microsoft/clc: Add -fgnu89-inline to clang args

Without this, inline functions don't have their body emitted in the
resulting LLVM IR, meaning the kernel will fail to link.

Reviewed-by: Karol Herbst <kherbst@redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/9085>

src/microsoft/clc/clc_helpers.cpp

@@ -596,6 +596,8 @@ clc_to_spirv(const struct clc_compile_args *args,
       "-fno-builtin-memset",
       // LLVM's optimizations can produce code that the translator can't translate
       "-O0",
+      // Ensure inline functions are actually emitted
+      "-fgnu89-inline"
    };
    // We assume there's appropriate defines for __OPENCL_VERSION__ and __IMAGE_SUPPORT__
    // being provided by the caller here.