adb: "support" O_CLOEXEC in adb_open on Windows.

Previously, we were rejecting the flag and failing with EINVAL. File
handles aren't inherited by default, so just ignore the flag.

Bug: http://b/123753498
Test: adb install --streaming foo.apk
Change-Id: I17401fcdd58024956d47a5c4c0c57b06831d9817
1 file changed