Import a259885e8c: Updated spirv-opt path in shadergen.py because of updates (by Maki)

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Commit:	a259885e8cdbb8d22c2c97ca4096e019c016a073
Author:	Maki
Date:	Mon, 27 Apr 2020 17:19

Updated spirv-opt path in shadergen.py because of updates

Stats:

Filename	Stats	Lines	Added	Removed	Lines in blame
tools/shadergen.py		2	1	1	⚠ 0
1 files	-	2	1	1	0

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