git: config(8): Fix building with -fno-common.

[Sascha Wildner]

commit 7ad467de76bd86b31c28856a13db16b21404239b
Author: Sascha Wildner <saw at online.de>
Date:   Sat Jun 27 15:20:18 2020 +0200

    config(8): Fix building with -fno-common.
    
    -fno-common will be default in future compilers (GCC 10, for example).

Summary of changes:
 usr.sbin/config/config.h | 15 +++++++++------
 usr.sbin/config/main.c   |  8 ++++++++
 2 files changed, 17 insertions(+), 6 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/7ad467de76bd86b31c28856a13db16b21404239b


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