Unify spellings of two perl variables that should be one. #185

Job	Run time
determine_asy_version	6s
lint-non-gui-files / check-if-non-gui-py-files-changed	10s
build-gui / build-gui-linux	12s
build-gui / build-gui-windows	42s
build-asy-windows / configure-windows-msvc-x64	10m 45s
build-asy-linux / configure-linux-release-x64	8m 13s
lint-non-gui-files / lint-python-files	0s
build-asy-linux / build-linux-release-x64	3m 14s
build-asy-windows / build-windows-msvc-x64	8m 26s
build-asy-linux / linux-asy-docgen	2m 21s
build-asy-linux / package-asymptote-artifacts	8s
test-asy-linux / test-x64-asy-tests	58s
test-asy-linux / test-x64-cxxtests	34s
package-asy-install-file / package-asy-installer	59s
test-asy-windows / test-windows-msvc-x64-cxxtests	48s
test-asy-windows / test-windows-msvc-x64-asy-tests	1m 19s
precheck-pass	1s
	38m 56s

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