backend: (riscv) don't print external function declaration in assembly

[superlopuh]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.89%. Comparing base (23745a6) to head (d22526d).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2855   +/-   ##
=======================================
  Coverage   89.89%   89.89%           
=======================================
  Files         398      398           
  Lines       49659    49676   +17     
  Branches     7633     7635    +2     
=======================================
+ Hits        44641    44658   +17     
  Misses       3821     3821           
  Partials     1197     1197           

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