git: gcc120: Clean up libstdcxx/libconv_supc's Makefile

[Aaron LI]

commit 6ecd44f609be0585aafd63d111d679d78e92e41a
Author: Aaron LI <aly at aaronly.me>
Date:   Mon Apr 6 17:09:21 2026 +0800

    gcc120: Clean up libstdcxx/libconv_supc's Makefile
    
    The 'gnu11', 'gnu14', and 'gnu1z' flags groups were inherited from gcc80
    and are not needed for gcc120, so just remove them.

Summary of changes:
 .../gcc120/libstdcxx/components/libconv_supc/Makefile   | 17 +++--------------
 1 file changed, 3 insertions(+), 14 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/6ecd44f609be0585aafd63d111d679d78e92e41a


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