version: show only the libpsl version, not its dependencies

The libpsl version output otherwise also includes version number for its
dependencies, like IDN lib, but since libcurl does not use libpsl's IDN
functionality those components are not important.

Ref: curl/curl-for-win#63
Closes curl#12700

lib/version.c

@@ -211,8 +211,12 @@ char *curl_version(void)
 #endif
 
 #ifdef USE_LIBPSL
-  msnprintf(psl_version, sizeof(psl_version), "libpsl/%s", psl_get_version());
-  src[i++] = psl_version;
+  {
+    int num = psl_check_version_number(0);
+    msnprintf(psl_version, sizeof(psl_version), "libpsl/%d.%d.%d",
+              num >> 16, (num >> 8) & 0xff, num & 0xff);
+    src[i++] = psl_version;
+  }
 #endif
 
 #ifdef USE_SSH