ClangSharpPInvokeGenerator does not handle unsigned int bitshifts correctly

[Exanite]

When generating bindings for Vulkan using ClangSharpPInvokeGenerator through Silk.NET 3, the following C code is not converted into compilable C# code due to the bitshifts.

This results in the following error:

/Vulkan/Vulkan.gen.cs(25934,10): error CS0019: Operator '<<' cannot be applied to operands of type 'uint' and 'uint'

---

Relevant C code: https://github.com/KhronosGroup/Vulkan-Headers/blob/main/include/vulkan/vulkan_core.h

#define VK_MAKE_API_VERSION(variant, major, minor, patch) \
    ((((uint32_t)(variant)) << 29U) | (((uint32_t)(major)) << 22U) | (((uint32_t)(minor)) << 12U) | ((uint32_t)(patch)))


//#define VK_API_VERSION VK_MAKE_API_VERSION(0, 1, 0, 0) // Patch version should always be set to 0

// Vulkan 1.0 version number
#define VK_API_VERSION_1_0 VK_MAKE_API_VERSION(0, 1, 0, 0)// Patch version should always be set to 0

Code as generated by Silk.NET:

[NativeTypeName("#define VK_API_VERSION_1_0 VK_MAKE_API_VERSION(0, 1, 0, 0)")]
public const uint VK_API_VERSION_1_0 = (
    (((uint)(0)) << 29U) | (((uint)(1)) << 22U) | (((uint)(0)) << 12U) | ((uint)(0))
);

Code as found in TerraFX Vulkan: https://raw.githubusercontent.com/terrafx/terrafx.interop.vulkan/refs/heads/main/sources/Interop/Vulkan/Vulkan/vulkan/vulkan_core/Vulkan.cs

[NativeTypeName("#define VK_API_VERSION_1_0 VK_MAKE_API_VERSION(0, 1, 0, 0)")]
public const uint VK_API_VERSION_1_0 = ((((uint)(0)) << 29) | (((uint)(1)) << 22) | (((uint)(0)) << 12) | ((uint)(0)));

Code when I regenerated the TerraFX Vulkan bindings locally (my Windows SDK version and Vulkan SDK version don't match, but I don't think that affects the code in question):
Note that the output matches Silk.NET, except in formatting, and the right-hand side of the bitshifts are unsigned ints.

[NativeTypeName("#define VK_API_VERSION_1_0 VK_MAKE_API_VERSION(0, 1, 0, 0)")]
public const uint VK_API_VERSION_1_0 = ((((uint)(0)) << 29U) | (((uint)(1)) << 22U) | (((uint)(0)) << 12U) | ((uint)(0)));

---

I'm guessing the bindings in TerraFX Vulkan are manually modified to fix the unsigned int bitshifts.

If this is a valid issue, I can take a look at contributing a fix.

Also let me know what the expected output should look like.
I'm thinking of casting the right-hand side into a normal signed int.
Alternatively, we can drop the U from the integer literal, but that's a less general solution.