gn/win: Add a runtime_link_output to tool("solink")
gn/win: Add a runtime_link_output to tool("solink")

See the CL description of https://codereview.chromium.org/1690843002/ for more.

BUG=354261, 498033
TBR=scottmg
NOTRY=true

Review URL: https://codereview.chromium.org/1687323003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#374894}

axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk