[Win32] Make Control bounds point/pixel conversion cope with rounding#2782

HeikoKlare wants to merge 2 commits intoeclipse-platform:mastereclipse-platform/eclipse.platform.swt:masterfrom

vi-eclipse:control-setbounds-shellcoordinates-lightvi-eclipse/eclipse.platform.swt:control-setbounds-shellcoordinates-lightCopy head branch name to clipboard