git: gcc80: Install the newly added headers for libstdc++

[Aaron LI]

commit 8739a1970b5a46348a057cd57330f8f264db8dce
Author: Aaron LI <aly at aaronly.me>
Date:   Tue Mar 31 19:48:26 2026 +0800

    gcc80: Install the newly added headers for libstdc++
    
    While there, clean up the Makefile.headers a bit according to the same
    file in gcc120.

Summary of changes:
 gnu/lib/gcc80/libstdcxx/headers/Makefile.headers | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/8739a1970b5a46348a057cd57330f8f264db8dce


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