mq: preserve --git flag when folding patches
Without this, folding a git patch into a regular one downgrades the resulting
patch to a regular patch.
% convert
initializing destination A-hg repository
scanning source...
sorting...
converting...
5 init projA
4 adda
3 changea
2 changea2
1 changea3
0 changea
updating tags
o 6 update tags tags: tip
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o 5 changea tags: trunk.goodtag
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o 4 changea3 tags:
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o 3 changea2 tags: trunk.v1
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o 2 changea tags:
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o 1 adda tags:
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o 0 init projA tags:
tip 6:
trunk.goodtag 5:
trunk.v1 3:
% convert without tags
initializing destination A-notags-hg repository
scanning source...
sorting...
converting...
5 init projA
4 adda
3 changea
2 changea2
1 changea3
0 changea
tip