Additional fixes for offscreen build in addition to GC+LSP #104

Job	Run time
determine_asy_version	6s
build-asy-linux / configure-linux-release-x64	43s
build-gui / build-gui-windows	50s
build-gui / build-gui-linux	11s
build-asy-windows / configure-windows-msvc-x64	1m 41s
build-asy-linux / build-linux-release-x64	1m 26s
build-asy-windows / build-windows-msvc-x64	6m 46s
build-asy-linux / linux-asy-docgen	2m 5s
build-asy-linux / package-asymptote-artifacts	5s
test-asy-linux / test-x64-cxxtests	25s
test-asy-linux / test-x64-asy-tests	37s
test-asy-windows / test-windows-msvc-x64-asy-tests	1m 0s
test-asy-windows / test-windows-msvc-x64-cxxtests	28s
package-asy-install-file / package-asy-installer	1m 1s
precheck-pass	1s
	17m 25s

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