[3.12] gh-110437: Allow overriding VCRuntimeDLL with a semicolon separated list of DLLs to bundle (GH-110470)

gh-110437: Allow overriding VCRuntimeDLL with a semicolon separated list of DLLs to bundle (GH-110470)
(cherry picked from commit 12cc6792d0ca1d0b72712d77c6efcb0aa0c7e7ba)

Co-authored-by: Steve Dower <steve.dower@python.org>