git: Makefile: Require explicit target

[Aaron LI]

commit 982afa6bbcf48b2254e9fe532add5e57be36d237
Author: Aaron LI <aly at aaronly.me>
Date:   Sat Jun 15 16:29:40 2019 +0800

    Makefile: Require explicit target
    
    Explicit target (e.g., buildworld, buildkernel) is required, otherwise
    fail with an error.
    
    Obtained-from: FreeBSD
    Bug-report: #3158

Summary of changes:
 Makefile | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/982afa6bbcf48b2254e9fe532add5e57be36d237


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