Fix for -m 1500, -m 3000: Missing "defined" keyword

Fix for -m 1500, -m 3000: Missing "defined" keyword
Fix for -m 1000: MD4_H1 copy/paste error
Fix for -m 8900, -m 9300: Invalid value for device_processor_cores for CPU devices
Fix for -m 9100: Variable salt2 initializer needed some clauses for clearness
Temporary limit gpu_accel for CPU devices to 1 for development phase
Mark pocl as too bleeding edge for production use, recommend native drivers
Remove workarounds for pocl
Rename VENDOR_ID_UNKNOWN to VENDOR_ID_GENERIC in host code
Rename IS_UNKNOWN to IS_GENERIC in kernel code