[Bug 293293] devel/spirv-llvm-translator: fix build of llvm12 flavor with clang 21

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=293293

            Bug ID: 293293
           Summary: devel/spirv-llvm-translator: fix build of llvm12
                    flavor with clang 21
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: jbeich@FreeBSD.org
          Reporter: dim@FreeBSD.org
             Flags: maintainer-feedback?(jbeich@FreeBSD.org)
          Assignee: jbeich@FreeBSD.org

With clang 21 the llvm12 flavor of devel/spirv-llvm-translator fails to
build, with errors similar to:

    In file included from
/wrkdirs/usr/ports/devel/spirv-llvm-translator/work-llvm12/SPIRV-LLVM-Translator-12.0.1/lib/SPIRV/OCLTypeToSPIRV.cpp:44:
    In file included from
/wrkdirs/usr/ports/devel/spirv-llvm-translator/work-llvm12/SPIRV-LLVM-Translator-12.0.1/lib/SPIRV/OCLUtil.h:42:
    In file included from
/wrkdirs/usr/ports/devel/spirv-llvm-translator/work-llvm12/SPIRV-LLVM-Translator-12.0.1/lib/SPIRV/SPIRVInternal.h:43:
    In file included from
/wrkdirs/usr/ports/devel/spirv-llvm-translator/work-llvm12/SPIRV-LLVM-Translator-12.0.1/lib/SPIRV/libSPIRV/SPIRVEnum.h:44:
    In file included from
/wrkdirs/usr/ports/devel/spirv-llvm-translator/work-llvm12/SPIRV-LLVM-Translator-12.0.1/lib/SPIRV/libSPIRV/SPIRVOpCode.h:45:
   
/wrkdirs/usr/ports/devel/spirv-llvm-translator/work-llvm12/SPIRV-LLVM-Translator-12.0.1/lib/SPIRV/libSPIRV/spirv_internal.hpp:120:31:
error: constexpr variable 'FunctionControlOptNoneINTELMask' must be initialized
by a constant expression
      120 | constexpr FunctionControlMask FunctionControlOptNoneINTELMask =
          |                               ^
      121 |    
static_cast<FunctionControlMask>(IFunctionControlOptNoneINTELMask);
          |    
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   
/wrkdirs/usr/ports/devel/spirv-llvm-translator/work-llvm12/SPIRV-LLVM-Translator-12.0.1/lib/SPIRV/libSPIRV/spirv_internal.hpp:121:5:
note: integer value 65536 is outside the valid range of values [0, 15] for the
enumeration type 'FunctionControlMask'
      121 |    
static_cast<FunctionControlMask>(IFunctionControlOptNoneINTELMask);
          |     ^

This is because clang 21 no longer allows enum values outside of the
valid range. Upstream spirv refactored a lot in this area, so the llvm13
flavor and later compile fine with clang 21.

Fix it by explicitly making the underlying type for the two affected
enums uint32_t.

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