curl: error out when options need features not present in libcurl

Trying to use a proxy when libcurl was built with proxy support disabled
should make curl error out properly.

Remove knowledge of disabled features from the tool code and instead
make it properly respond to what libcurl returns. Update all tests to
properly require the necessary features to be present/absent so that the
test suite can still be run even with libcurl builds with disabled
features.

Ref: https://curl.se/mail/archive-2022-03/0013.html
Closes #8565

tests/data/test1004

@@ -29,6 +29,9 @@ Funny-head: yesyes
 #
 # Client-side
 <client>
+<features>
+proxy
+</features>
 <server>
 http
 </server>

tests/data/test1034

@@ -25,6 +25,7 @@ none
 <features>
 idn
 http
+proxy
 </features>
 <setenv>
 LC_ALL=

tests/data/test1035

@@ -23,6 +23,7 @@ none
 <features>
 idn
 http
+proxy
 </features>
 <setenv>
 LC_ALL=

tests/data/test1212

@@ -23,6 +23,9 @@ boo
 
 # Client-side
 <client>
+<features>
+proxy
+</features>
 <server>
 http
 </server>

tests/data/test1248

@@ -22,6 +22,9 @@ foo
 
 # Client-side
 <client>
+<features>
+proxy
+</features>
 <server>
 http
 </server>

tests/data/test1249

@@ -22,6 +22,9 @@ foo
 
 # Client-side
 <client>
+<features>
+proxy
+</features>
 <server>
 http
 </server>

tests/data/test1252

@@ -23,6 +23,9 @@ foo
 
 # Client-side
 <client>
+<features>
+proxy
+</features>
 <server>
 http
 </server>

tests/data/test700

@@ -29,6 +29,9 @@ Funny-head: yesyes
 #
 # Client-side
 <client>
+<features>
+proxy
+</features>
 <server>
 http
 socks4

tests/data/test701

@@ -29,6 +29,9 @@ Funny-head: yesyes
 #
 # Client-side
 <client>
+<features>
+proxy
+</features>
 <server>
 http
 socks5

tests/data/test702

@@ -20,6 +20,9 @@ response 91
 
 # Client-side
 <client>
+<features>
+proxy
+</features>
 <server>
 socks4
 </server>

tests/data/test706

@@ -31,6 +31,9 @@ dr-xr-xr-x   5 0        1            512 Oct  1  1997 usr
 #
 # Client-side
 <client>
+<features>
+proxy
+</features>
 <server>
 ftp
 socks4

tests/data/test707

@@ -31,6 +31,9 @@ dr-xr-xr-x   5 0        1            512 Oct  1  1997 usr
 #
 # Client-side
 <client>
+<features>
+proxy
+</features>
 <server>
 ftp
 socks5

tests/data/test708

@@ -29,6 +29,9 @@ Funny-head: yesyes
 #
 # Client-side
 <client>
+<features>
+proxy
+</features>
 <server>
 http
 socks4

tests/data/test709

@@ -29,6 +29,9 @@ Funny-head: yesyes
 #
 # Client-side
 <client>
+<features>
+proxy
+</features>
 <server>
 http
 socks5

tests/data/test710

@@ -29,6 +29,9 @@ Funny-head: yesyes
 #
 # Client-side
 <client>
+<features>
+proxy
+</features>
 <server>
 http
 socks5

tests/data/test711

@@ -22,6 +22,9 @@ silly content
 #
 # Client-side
 <client>
+<features>
+proxy
+</features>
 <server>
 ftp
 socks5

tests/data/test712

@@ -19,6 +19,9 @@ silly content
 #
 # Client-side
 <client>
+<features>
+proxy
+</features>
 <server>
 ftp
 socks5

tests/data/test713

@@ -20,6 +20,9 @@ silly content
 #
 # Client-side
 <client>
+<features>
+proxy
+</features>
 <server>
 ftp
 socks5

tests/data/test714

@@ -35,6 +35,9 @@ silly content
 #
 # Client-side
 <client>
+<features>
+proxy
+</features>
 <server>
 ftp
 http-proxy

tests/data/test715

@@ -36,6 +36,9 @@ silly content
 #
 # Client-side
 <client>
+<features>
+proxy
+</features>
 <server>
 ftp
 http-proxy