Merge "Optimize _apkcerts_write_line" into main

# $5 partition tag

# $6 output file

define _apkcerts_write_line

$(hide) echo -n 'name="$(1).apk" certificate="$2" private_key="$3"' >> $6

$(if $(4), $(hide) echo -n ' compressed="$4"' >> $6)

$(if $(5), $(hide) echo -n ' partition="$5"' >> $6)

$(hide) echo '' >> $6

$(hide) echo 'name="$(1).apk" certificate="$2" private_key="$3"$(if $(4), compressed="$4")$(if $(5), partition="$5")' >> $6

endef