Add rocketmq libpath to ldconf to support dlopen in CentOS

[IterableTrucks]

What is the purpose of the change

fix bug in rpm spec

Brief changelog

make librocketmq.so accessible to dlopen()

Verifying this change

XXXX

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[codecov-commenter]

Codecov Report

Merging #315 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #315   +/-   ##
=======================================
  Coverage   59.00%   59.00%           
=======================================
  Files         205      205           
  Lines       12987    12987           
=======================================
  Hits         7663     7663           
  Misses       5324     5324           

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