[DynInst_API:] [dyninst/dyninst] 20673a: Add search of libgcc.a to x86 and aarch64 (#731)

[Sasha NÃcolas <noreply@xxxxxxxxxx>]

  Branch: refs/heads/master
  Home:   https://github.com/dyninst/dyninst
  Commit: 20673aae1701fd656b649dee9711ccc270c84a06
      https://github.com/dyninst/dyninst/commit/20673aae1701fd656b649dee9711ccc270c84a06
  Author: Sasha NÃcolas <sasha@xxxxxxxxxxx>
  Date:   2020-03-27 (Fri, 27 Mar 2020)

  Changed paths:
    M dyninstAPI/src/parse-aarch64.C
    M dyninstAPI/src/parse-power.C
    M dyninstAPI/src/parse-x86.C

  Log Message:
  -----------
  Add search of libgcc.a to x86 and aarch64 (#731)

and warn user if it's not found.