config-riscos.h: delete handcrafted RISC OS config header, in favor of autotools

[vszakats]

According to the content of the latest downloadable builds available at
(from 2022): https://www.riscos.info/packages/src/Network/, these builds
used autotools, not the handcrafted header. Also the handcrafted header
did not see an update (that I could find) since
0866c1b (2002-04-08), other than
source-wide maintenance updates.

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The newer, 8.0.1, download listed at https://curl.se/download.html#RISCOS
leads to a broken link. I assume it was also built with autotools.

https://www.riscos.info/packages/src/Network/curl_7.84.0-1_arm-src.zip:

It was created by curl configure -, which was
generated by GNU Autoconf 2.71.  Invocation command line was

  $ ./configure --host=arm-unknown-riscos --build=aarch64-unknown-linux-gnu --prefix=/data/gccsdk/env --x-libraries=/data/gccsdk/env/lib --x-includes=/data/gccsdk/env/include --enable-shared=no --enable-static=yes --with-openssl=/data/gccsdk/env --with-ssl --enable-ares --disable-ipv6 --without-brotli --without-gnutls --with-libssh2 --with-ca-bundle=InetDBase:CertData

[Copilot]

Pull request overview

Removes the obsolete handcrafted RISC OS configuration, standardizing RISC OS builds on autotools-generated configuration.

Changes:

• Deletes config-riscos.h.
• Removes its conditional inclusion and distribution entry.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
lib/Makefile.am	Stops distributing the obsolete header.
lib/curl_setup.h	Removes handcrafted RISC OS configuration loading.
lib/config-riscos.h	Deletes the legacy configuration.

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