Remove shared/math folder #1852

Job	Run time
RuboCop	31s
specs (ubuntu, 3.0.6)	1m 30s
specs (ubuntu, 3.1.4)	1m 32s
specs (ubuntu, 3.2.2)	1m 24s
specs (ubuntu, 3.3.0)	1m 26s
specs (macos, 3.0.6)	1m 34s
specs (macos, 3.1.4)	1m 19s
specs (macos, 3.2.2)	1m 31s
specs (macos, 3.3.0)	1m 13s
specs (windows, 3.0.6)	4m 2s
specs (windows, 3.1.4)	5m 14s
specs (windows, 3.2.2)	4m 45s
specs (windows, 3.3.0)	3m 56s
specs (ubuntu, 3.3.0, --enable-frozen-string-literal)	1m 25s
	31m 22s

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