MDEV-23176: s3 curl library path fix

On FreeBSD (and possibly elsewhere) the FindPackage(curl)
may have found the curl library in a non-standard directory.

We use the exposed path as a library path to correct linking.

storage/maria/CMakeLists.txt

@@ -116,6 +116,7 @@ IF(NOT PLUGIN_S3 STREQUAL NO)
 ENDIF()
 
 IF (CURL_FOUND)
+  LINK_DIRECTORIES(${PC_CURL_LIBDIR})
   MYSQL_ADD_PLUGIN(s3 ha_s3.cc ${S3_SOURCES} COMPONENT s3-engine
     LINK_LIBRARIES curl STORAGE_ENGINE NOT_EMBEDDED CONFIG s3.cnf)
 ENDIF()