Pass -Brepro ldflag to Windows builds

The default build-id is generated using timestamp. Pass -Brepro to
avoid using timestamp for deterministic build.

Bug: 153462962
Test: build fastboot.exe twice, got same shasum
Change-Id: I38fe993eec23c60bfcf1b76188774bfe06839fa4
Merged-In: I38fe993eec23c60bfcf1b76188774bfe06839fa4
(cherry picked from commit a3c22e7e)
Exempt-From-Owner-Approval: backport