ext/curl: Bump minimim Curl version to >= 7.61.0

Bumps the minimum required libcurl version to 7.61.0.

Please also see #4917, which bumped minimum libcurl version to the current >= 7.29.0.

Ubuntu, Debian, RHEL, and RHEL derivatives have major and LTS version bumps this year. Following are the
libcurl-dev/libcurl-devel versions available in the oldest supported (LTS or otherwise) in major OSs.

 - Debian buster: [7.64](https://packages.debian.org/buster/libcurl4-openssl-dev)
 - Ubuntu 20.04: [7.68](https://packages.ubuntu.com/focal/libcurl-dev)
 - CentOS/RHEL 7: 7.29
 - RHEL 8/Rocky 8/EL 8: 7.61
 - Fedora 38: 7.87

RHEL/CentOS 7 reaches EOL mid 2024, so for PHP 8.4 scheduled towards the end of this year, we can safely
bump the minimum libcurl version.

7.61.0 was selected as the new minimum because RHEL and derivatives have libcurl-devel version 7.61. RHEL 8 is
a current and supported RHEL version.

Author: Ayesh

ext/curl/config.m4

@@ -4,7 +4,7 @@ PHP_ARG_WITH([curl],
     [Include cURL support])])
 
 if test "$PHP_CURL" != "no"; then
-  PKG_CHECK_MODULES([CURL], [libcurl >= 7.29.0])
+  PKG_CHECK_MODULES([CURL], [libcurl >= 7.61.0])
   PKG_CHECK_VAR([CURL_FEATURES], [libcurl], [supported_features])
 
   PHP_EVAL_LIBLINE($CURL_LIBS, CURL_SHARED_LIBADD)

ext/curl/curl.stub.php

@@ -472,13 +472,11 @@
  * @cvalue CURLOPT_WRITEHEADER
  */
 const CURLOPT_WRITEHEADER = UNKNOWN;
-#if LIBCURL_VERSION_NUM >= 0x072000
 /**
  * @var int
  * @cvalue CURLOPT_XFERINFOFUNCTION
  */
 const CURLOPT_XFERINFOFUNCTION = UNKNOWN;
-#endif
 
 /* */
 /**
@@ -776,13 +774,11 @@
  * @cvalue CURLE_SSL_PEER_CERTIFICATE
  */
 const CURLE_SSL_PEER_CERTIFICATE = UNKNOWN;
-#if LIBCURL_VERSION_NUM >= 0x072700 /* Available since 7.39.0 */
 /**
  * @var int
  * @cvalue CURLE_SSL_PINNEDPUBKEYNOTMATCH
  */
 const CURLE_SSL_PINNEDPUBKEYNOTMATCH = UNKNOWN;
-#endif
 /**
  * @var int
  * @cvalue CURLE_TELNET_OPTION_SYNTAX
@@ -2421,7 +2417,6 @@
 const CURLOPT_SASL_IR = UNKNOWN;
 #endif
 
-#if LIBCURL_VERSION_NUM >= 0x072100 /* Available since 7.33.0 */
 /**
  * @var int
  * @cvalue CURLOPT_DNS_INTERFACE
@@ -2453,7 +2448,6 @@
  * @cvalue CURL_VERSION_HTTP2
  */
 const CURL_VERSION_HTTP2 = UNKNOWN;
-#endif
 
 #if LIBCURL_VERSION_NUM >= 0x072200 /* Available since 7.34.0 */
 /**
@@ -2479,7 +2473,6 @@
 const CURL_SSLVERSION_TLSv1_2 = UNKNOWN;
 #endif
 
-#if LIBCURL_VERSION_NUM >= 0x072400 /* Available since 7.36.0 */
 /**
  * @var int
  * @cvalue CURLOPT_EXPECT_100_TIMEOUT_MS
@@ -2495,7 +2488,6 @@
  * @cvalue CURLOPT_SSL_ENABLE_NPN
  */
 const CURLOPT_SSL_ENABLE_NPN = UNKNOWN;
-#endif
 
 #if LIBCURL_VERSION_NUM >= 0x072500 /* Available since 7.37.0 */
 /**
@@ -2520,7 +2512,6 @@
 const CURLOPT_PROXYHEADER = UNKNOWN;
 #endif
 
-#if LIBCURL_VERSION_NUM >= 0x072600 /* Available since 7.38.0 */
 /**
  * @var int
  * @cvalue CURLAUTH_NEGOTIATE
@@ -2531,7 +2522,6 @@
  * @cvalue CURL_VERSION_GSSAPI
  */
 const CURL_VERSION_GSSAPI = UNKNOWN;
-#endif
 
 #if LIBCURL_VERSION_NUM >= 0x072700 /* Available since 7.39.0 */
 /**
@@ -2541,7 +2531,6 @@
 const CURLOPT_PINNEDPUBLICKEY = UNKNOWN;
 #endif
 
-#if LIBCURL_VERSION_NUM >= 0x072800 /* Available since 7.40.0 */
 /**
  * @var int
  * @cvalue CURLOPT_UNIX_SOCKET_PATH
@@ -2567,15 +2556,12 @@
  * @cvalue CURL_VERSION_UNIX_SOCKETS
  */
 const CURL_VERSION_UNIX_SOCKETS = UNKNOWN;
-#endif
 
-#if LIBCURL_VERSION_NUM >= 0x072900 /* Available since 7.41.0 */
 /**
  * @var int
  * @cvalue CURLOPT_SSL_VERIFYSTATUS
  */
 const CURLOPT_SSL_VERIFYSTATUS = UNKNOWN;
-#endif
 
 #if LIBCURL_VERSION_NUM >= 0x072a00 /* Available since 7.42.0 */
 /**

ext/curl/curl_arginfo.h

@@ -73,9 +73,7 @@ typedef struct {
 	php_curl_read     *read;
 	zval               std_err;
 	php_curl_callback *progress;
-#if LIBCURL_VERSION_NUM >= 0x072000
 	php_curl_callback  *xferinfo;
-#endif
 	php_curl_callback  *fnmatch;
 #if LIBCURL_VERSION_NUM >= 0x075400
 	php_curl_callback  *sshhostkey;