refactor(@angular/build): normalize source path for windows compatibi… #98

Job	Run time
list	42s
workflow (build-cli)	48s
workflow (modules-builder-tests)	43s
workflow (devkit-core-tests)	47s
workflow (devkit-core-tests-rerun)	42s
workflow (build-unit-tests)	41s
	4m 23s

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