mail/queue-repair: fix patch and refactor

• remove stray shebang, (q)nofiles changes from patch file (I ran makepatch, which picked up REINPLACE_CMD changes)
• replace homegrown REINPLACE_CMD with USES=shebangfix
• set NO_ARCH=yes, NO_BUILD=yes
• express options-dependent commands in more declarative manner

Fixes: 809ff8bfc9d4b3221ed5c5329d70d40ba3c8e900
Reported by: danfe
Approved by: portmgr (build fix, infrastructure blanket)
MFH: 2023Q2