install-gosu-binary: Run gpgconf --kill only if option is available
install-gosu-binary: Run gpgconf --kill only if option is available

dockcross/dockcross,thewtex/cross-compilers,dockcross/dockcross,thewtex/cross-compilers,dockcross/dockcross,thewtex/cross-compilers,thewtex/cross-compilers,dockcross/dockcross