check if numa available or not before loading numa functions

[TingDaoK]

Issue #, if available:

#1162

Description of changes:

Before any other calls in this library can be used numa_available() must be called. If it returns -1, all other functions in this library are undefined.

Referring to https://linux.die.net/man/3/numa_available. So, if numa_available() return -1, skip loading any other functions from libnuma.

• We are lacking tests for numa functionalities, which is a concern.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 71.42857% with 4 lines in your changes missing coverage. Please review.

Project coverage is 83.60%. Comparing base (6f20cfb) to head (418bbea).

Files with missing lines	Patch %	Lines
source/common.c	71.42%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1163      +/-   ##
==========================================
- Coverage   83.61%   83.60%   -0.02%     
==========================================
  Files          57       57              
  Lines        5946     5948       +2     
==========================================
+ Hits         4972     4973       +1     
- Misses        974      975       +1     

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