--disable-proxy build causes tests failing

[MarcelRaad]

I did this

As seen in this autobuild:
https://curl.haxx.se/dev/log.cgi?id=20190522044629-2216

./configure --enable-threaded-resolver --disable-pthreads --enable-debug --enable-warnings --enable-curldebug --enable-optimize --enable-static --disable-shared --enable-http --disable-ftp --disable-file --disable-ldap --disable-ldaps --disable-rtsp --disable-dict --disable-telnet --disable-tftp --disable-pop3 --disable-imap --disable-smb --disable-smtp --disable-gopher --disable-manual --disable-libcurl-option --enable-ipv6 --enable-sspi --disable-cookies --without-zlib --without-libpsl --without-libmetalink --without-libssh2 --without-librtmp --without-winidn --without-libidn2 --without-nghttp2 --without-zsh-functions-dir --without-brotli --disable-proxy --disable-crypto-auth --with-ssl && make && cd tests && ./runtests.pl -a -p -v 19 20 1084 1085 1247 1260 1263 1264 1281 1291 2075 2080

I expected the following

The tests to succeed. Instead, they failed with curl: (48) An unknown option was passed in to libcurl. The unknown option was always 10254 (CURLOPT_PROXY_SSLCERT).

curl/libcurl version

a57e478

operating system

MSYS2 on Windows 10 using MinGW-w64