Test 'git add' for unmerged entries when core.symlinks=false.
Test 'git add' for unmerged entries when core.symlinks=false.

In 20314271679e169f324c118c69c8d9e0399feec9 git add was fixed if unmerged
entries are in the index and core.filemode=false. core.symlinks=false is
a similar case, which touches the same code path. Here is a test that
makes sure that the symlink property in the index is preserved, too.

Signed-off-by: Johannes Sixt <5cc107486946fdcf16e86d7c808fa50f4312125f@telecom.at>
Signed-off-by: Junio C Hamano <a6723cc3f76163bf7adb636a73ac3b0ceb3e6b9b@pobox.com>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git