build: drop unused includes

`curl_endian.h`, `easyif.h`, `llist.h`, `progress.h`, `slist.h`.

Also:
- multi_ev.h: delete unused include, add a missing direct one.

Closes #20025

lib/conncache.c

@@ -32,7 +32,6 @@
 #include "cfilters.h"
 #include "progress.h"
 #include "multiif.h"
-#include "multi_ev.h"
 #include "sendf.h"
 #include "cshutdn.h"
 #include "conncache.h"

lib/curl_ntlm_core.c

@@ -119,7 +119,6 @@
 #include "curl_md5.h"
 #include "curl_hmac.h"
 #include "curlx/warnless.h"
-#include "curl_endian.h"
 #include "curl_md4.h"
 
 #ifdef USE_CURL_DES_SET_ODD_PARITY

lib/curl_trc.c

@@ -28,7 +28,6 @@
 
 #include "curl_trc.h"
 #include "urldata.h"
-#include "easyif.h"
 #include "cfilters.h"
 #include "multiif.h"
 

lib/dict.c

@@ -57,7 +57,6 @@
 #include "transfer.h"
 #include "sendf.h"
 #include "escape.h"
-#include "progress.h"
 #include "dict.h"
 
 #define DICT_MATCH   "/MATCH:"

lib/easy.c

@@ -54,9 +54,9 @@
 #include "getinfo.h"
 #include "hostip.h"
 #include "strdup.h"
-#include "progress.h"
 #include "easyif.h"
 #include "multiif.h"
+#include "multi_ev.h"
 #include "select.h"
 #include "cfilters.h"
 #include "sendf.h" /* for failf function prototype */

lib/getinfo.c

@@ -31,7 +31,6 @@
 #include "cfilters.h"
 #include "vtls/vtls.h"
 #include "connect.h" /* Curl_getconnectinfo() */
-#include "progress.h"
 #include "bufref.h"
 #include "curlx/strparse.h"
 

lib/gopher.c

@@ -32,7 +32,6 @@
 #include "sendf.h"
 #include "cfilters.h"
 #include "connect.h"
-#include "progress.h"
 #include "gopher.h"
 #include "select.h"
 #include "vtls/vtls.h"

lib/hash.c

@@ -27,7 +27,6 @@
 #include <curl/curl.h>
 
 #include "hash.h"
-#include "llist.h"
 
 /* random patterns for API verification */
 #ifdef DEBUGBUILD

lib/hash.h

@@ -28,8 +28,6 @@
 
 #include <stddef.h>
 
-#include "llist.h"
-
 /* Hash function prototype */
 typedef size_t (*hash_function)(void *key,
                                 size_t key_length,

lib/http_proxy.c

@@ -33,7 +33,6 @@
 #include "http.h"
 #include "url.h"
 #include "select.h"
-#include "progress.h"
 #include "cfilters.h"
 #include "cf-h1-proxy.h"
 #include "cf-h2-proxy.h"

lib/multi.c

@@ -32,7 +32,6 @@
 #include "cfilters.h"
 #include "connect.h"
 #include "progress.h"
-#include "easyif.h"
 #include "curl_share.h"
 #include "psl.h"
 #include "multiif.h"

lib/multi_ev.c

@@ -33,7 +33,6 @@
 #include "multiif.h"
 #include "curlx/timeval.h"
 #include "multi_ev.h"
-#include "progress.h"
 #include "select.h"
 #include "uint-bset.h"
 #include "uint-spbset.h"

lib/ratelimit.c

@@ -25,7 +25,6 @@
 #include "curl_setup.h"
 
 #include "curlx/timeval.h"
-#include "progress.h"
 #include "ratelimit.h"
 
 

lib/sendf.c

@@ -46,7 +46,6 @@
 #include "cw-pause.h"
 #include "vtls/vtls.h"
 #include "vssh/ssh.h"
-#include "easyif.h"
 #include "multiif.h"
 #include "strerror.h"
 #include "select.h"

lib/uint-hash.h

@@ -28,8 +28,6 @@
 
 #include <stddef.h>
 
-#include "llist.h"
-
 /* A version with uint32_t as key */
 typedef void Curl_uint32_hash_dtor(uint32_t id, void *value);
 struct uint_hash_entry;

lib/url.c

@@ -88,7 +88,6 @@
 #include "http_negotiate.h"
 #include "select.h"
 #include "multiif.h"
-#include "easyif.h"
 #include "curlx/warnless.h"
 #include "getinfo.h"
 #include "pop3.h"

lib/vtls/openssl.c

@@ -52,7 +52,6 @@
 #include "../curlx/inet_pton.h"
 #include "openssl.h"
 #include "../connect.h"
-#include "../slist.h"
 #include "../progress.h"
 #include "../select.h"
 #include "../curlx/wait.h"

tests/unit/unit1607.c

@@ -25,7 +25,6 @@
 
 #include "urldata.h"
 #include "connect.h"
-#include "progress.h"
 
 static CURLcode t1607_setup(void)
 {