php8-pecl-http: add compile-time hint about TLS13 ciphers (fixes#17332)
When cURL is built with OpenSSL as backend SSL/TLS library,
pecl_http's configure tries to detect whether TLS 1.3 ciphers
are enabled. This does not work when cross-compiling so let's
pass it based on OpenSSL build configuration.
Signed-off-by: Michael Heimpold <mhei@heimpold.de>