Fixed incorrect function redeclaration in the testsuite.
This fixes 'make check' with LTO.

Author: Karlson2k (Evgeny Grin)
Gentoo bug: https://bugs.gentoo.org/877447


diff --git a/src/testcurl/https/test_https_get_parallel.c b/src/testcurl/https/test_https_get_parallel.c
index 47f644d2..786918f2 100644
--- a/src/testcurl/https/test_https_get_parallel.c
+++ b/src/testcurl/https/test_https_get_parallel.c
@@ -46,7 +46,7 @@
 extern const char srv_key_pem[];
 extern const char srv_self_signed_cert_pem[];
 
-int curl_check_version (const char *req_version, ...);
+int curl_check_version (const char *req_version);
 
 
 /**
diff --git a/src/testcurl/https/test_https_get_parallel_threads.c b/src/testcurl/https/test_https_get_parallel_threads.c
index 4853e7eb..5f4d0486 100644
--- a/src/testcurl/https/test_https_get_parallel_threads.c
+++ b/src/testcurl/https/test_https_get_parallel_threads.c
@@ -48,7 +48,7 @@
 extern const char srv_key_pem[];
 extern const char srv_self_signed_cert_pem[];
 
-int curl_check_version (const char *req_version, ...);
+int curl_check_version (const char *req_version);
 
 /**
  * used when spawning multiple threads executing curl server requests
diff --git a/src/testcurl/https/test_tls_options.c b/src/testcurl/https/test_tls_options.c
index d5aa8310..8fbc540a 100644
--- a/src/testcurl/https/test_tls_options.c
+++ b/src/testcurl/https/test_tls_options.c
@@ -36,7 +36,7 @@
 extern const char srv_key_pem[];
 extern const char srv_self_signed_cert_pem[];
 
-int curl_check_version (const char *req_version, ...);
+int curl_check_version (const char *req_version);
 
 /**
  * test server refuses to negotiate connections with unsupported protocol versions
diff --git a/src/testcurl/https/tls_test_common.h b/src/testcurl/https/tls_test_common.h
index a9af504d..e3f552a8 100644
--- a/src/testcurl/https/tls_test_common.h
+++ b/src/testcurl/https/tls_test_common.h
@@ -72,7 +72,7 @@ struct CipherDef
 
 
 int
-curl_check_version (const char *req_version, ...);
+curl_check_version (const char *req_version);
 
 int
 curl_tls_is_gnutls (void);