The php8 Makefile is already quite large. To improve readability, move
config section to a separate 'Config.in' file. To ensure that the PHP8
option is only saved in '.config' if PHP8 has been selected for building. A
depends on 'PACKAGE_php8' is added to the configuration option in the
'Config.in' file.
Signed-off-by: Florian Eckert <fe@dev.tdt.de>
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