RPM: generate per-plugin.cnf files where git will ignore them

cmake/plugin.cmake

@@ -238,7 +238,7 @@ MACRO(MYSQL_ADD_PLUGIN)
         SET(CPACK_RPM_${ARG_COMPONENT}_USER_FILELIST ${ignored} PARENT_SCOPE)
         IF(NOT ARG_CLIENT AND UNIX)
           IF (NOT ARG_CONFIG)
-            SET(ARG_CONFIG "${CMAKE_CURRENT_BINARY_DIR}/${target}.cnf")
+            SET(ARG_CONFIG "${CMAKE_CURRENT_BINARY_DIR}/CMakeFiles/${target}.cnf")
             FILE(WRITE ${ARG_CONFIG} "[mariadb]\nplugin-load-add=${ARG_MODULE_OUTPUT_NAME}.so\n")
           ENDIF()
           INSTALL(FILES ${ARG_CONFIG} COMPONENT ${ARG_COMPONENT} DESTINATION ${INSTALL_SYSCONF2DIR})