cmake: Port warning configuration from make

Adds SRB2_CONFIG_ERRORMODE to replace ERRORMODE too.

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• 236c80cd - cmake: Port warning configuration from make

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• a324bbcf - cmake: Port warning configuration from make

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-DSRB2_CONFIG_ERRORMODE=ON does not build for me due to the aggregate-return warning, since libdivide.h uses aggregate returns intentionally. To be fair though, I'm pretty sure this is an issue with Makefiles also, so I won't let it stop my +1.

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• 4f4d99e3 - cmake: Port warning configuration from make

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• 106d115c - cmake: Port warning configuration from make

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merged

mentioned in commit 00179e44