Shunt async dispatch for broken ICDs

Callbacks are part of minimum specification in OpenCL since v1.1 and continuing to today in v3 variants. There is no reason any ICD provider shouldn't support them. However, some ICD providers (like PoCL) don't support them correctly on all "supported" systems. Hence, set environment variable "QRACK_OCL_SYNC" to any "truthy" value to "shunt" OpenCL callbacks to fully synchronous dispatch. (Performance will be poorer, but your ICD provider otherwise might not support the minimum specification for OpenCL for your system at all, in practice.)

Full Changelog: v2.28.1...v2.28.2

sha1sum results:
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