graphics: Write out exactly the original content of Vulkan/EGL driver manifests
Follow-up for !595 (merged), originally part of !602 (merged).
/cc @denittis
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graphics: Write out exactly the original content, if known
Originally part of !602 (merged), follow-up for !595 (merged). Since we now have the original content of the JSON manifest in memory for Vulkan and EGL drivers (and EGL external platforms), we might we might as well write it out directly, instead of re-serializing it.
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tests: Assert that srt_vulkan_icd_write_to_file copies original content
Edited by Simon McVittie