git-curl-compat: remove check for curl 7.52.0

libcurl 7.52.0 was released in August 2017, which is over seven years
ago, and no major operating system vendor is still providing security
support for it.  Debian 9 and Ubuntu 18.04, both of which are out of
mainstream security support, have supported a newer version, and RHEL 8,
which is still in support, also has a newer version.

Remove the check for this version and use this functionality
unconditionally.

Signed-off-by: brian m. carlson <[email protected]>
Signed-off-by: Taylor Blau <[email protected]>

Author: bk2204

git-curl-compat.h

@@ -28,21 +28,6 @@
  * introduced, oldest first, in the official version of cURL library.
  */
 
-/**
- * CURLOPT_PROXY_CAINFO was added in 7.52.0, released in August 2017.
- */
-#if LIBCURL_VERSION_NUM >= 0x073400
-#define GIT_CURL_HAVE_CURLOPT_PROXY_CAINFO 1
-#endif
-
-/**
- * CURLOPT_PROXY_{KEYPASSWD,SSLCERT,SSLKEY} was added in 7.52.0,
- * released in August 2017.
- */
-#if LIBCURL_VERSION_NUM >= 0x073400
-#define GIT_CURL_HAVE_CURLOPT_PROXY_KEYPASSWD 1
-#endif
-
 /**
  * CURL_SSLVERSION_TLSv1_3 was added in 7.53.0, released in February
  * 2017.

http.c

@@ -691,7 +691,6 @@ static int has_cert_password(void)
 	return 1;
 }
 
-#ifdef GIT_CURL_HAVE_CURLOPT_PROXY_KEYPASSWD
 static int has_proxy_cert_password(void)
 {
 	if (http_proxy_ssl_cert == NULL || proxy_ssl_cert_password_required != 1)
@@ -705,7 +704,6 @@ static int has_proxy_cert_password(void)
 	}
 	return 1;
 }
-#endif
 
 static void set_curl_keepalive(CURL *c)
 {
@@ -1093,16 +1091,12 @@ static CURL *get_curl_handle(void)
 	if (http_ssl_backend && !strcmp("schannel", http_ssl_backend) &&
 	    !http_schannel_use_ssl_cainfo) {
 		curl_easy_setopt(result, CURLOPT_CAINFO, NULL);
-#ifdef GIT_CURL_HAVE_CURLOPT_PROXY_CAINFO
 		curl_easy_setopt(result, CURLOPT_PROXY_CAINFO, NULL);
-#endif
 	} else if (ssl_cainfo != NULL || http_proxy_ssl_ca_info != NULL) {
 		if (ssl_cainfo)
 			curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
-#ifdef GIT_CURL_HAVE_CURLOPT_PROXY_CAINFO
 		if (http_proxy_ssl_ca_info)
 			curl_easy_setopt(result, CURLOPT_PROXY_CAINFO, http_proxy_ssl_ca_info);
-#endif
 	}
 
 	if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
@@ -1198,7 +1192,6 @@ static CURL *get_curl_handle(void)
 		else if (starts_with(curl_http_proxy, "socks"))
 			curl_easy_setopt(result,
 				CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4);
-#ifdef GIT_CURL_HAVE_CURLOPT_PROXY_KEYPASSWD
 		else if (starts_with(curl_http_proxy, "https")) {
 			curl_easy_setopt(result, CURLOPT_PROXYTYPE, CURLPROXY_HTTPS);
 
@@ -1211,7 +1204,6 @@ static CURL *get_curl_handle(void)
 			if (has_proxy_cert_password())
 				curl_easy_setopt(result, CURLOPT_PROXY_KEYPASSWD, proxy_cert_auth.password);
 		}
-#endif
 		if (strstr(curl_http_proxy, "://"))
 			credential_from_url(&proxy_auth, curl_http_proxy);
 		else {