Merge branch 'jk/dev-build-format-security' into maint

Build tweak to help developers. * jk/dev-build-format-security: config.mak.dev: add -Wformat-security

Junio C Hamano committed Nov 21, 2018 at 22:57 UTC d9e70a4e63d25ed0355fed5b01431f2215614007

No changes.