Bump version to 3.0.1
Bugfix: configure: Use variable argument to roundl to prevent compilers from optimizing it out entirely
Bugfix: configure: Use dummy pointer to correctly detect roundl when conftest main is missing argc parameter
Bugfix: configure: Move actual roundl macro back to miner.h after math.h should be included

Otherwise systems that have roundl defined (but broken/missing) will error when the macro interferes with the definition
Merge commit '0cd0a01' into bfgminer
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