fix: Fix a vulkan-shaders-gen arugment parsing error

[sparkleholic]

The vulkan-shaders-gen was not parsing the --no-clean argument correctly. Because the previous code was parsing the arguments which have a value only and the --no-clean argument does not have a value, it was not being parsed correctly. This commit can now correctly parse arguments that don't have values.

$ vulkan-shaders-gen --glslc <glslc path> --input-dir ggml/src/vulkan-shaders --output-dir <vulkan-shaders.spv directory> --target-hpp <ggml-vulkan-shaders.hpp output path> --target-cpp <ggml-vulkan-shaders.cpp output path> --no-clean

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[jeffbolznv]

Is this covered by #10445?

[sparkleholic]

@jeffbolznv
#10445 can fix the issue where the --no-clean is not handled. However, this patch seems better to improve the code that avoid bugs when handling arguments and values, not just the problem of --no-clean. With this patch, arguments doesn't have to be used with a value.

[netrunnereve]

Yeah this is better than my #10445 as it doesn't alter the build commands (in the unlikely case where someone has a custom script for this) and allows us to keep supporting single arguments in the future. I've tested this and it works properly on my end.