OpenBSD can do binary merges with objcopy.

[nanolith]

Added defined(OpenBSD) to the platform check for binary merge in goto-cc/hybrid_binary.cpp

• [ X ] Each commit message has a non-empty body, explaining why the change was made.
• [ X ] Methods or procedures I have added are documented, following the guidelines provided in CODING_STANDARD.md.
• [ X ] The feature or user visible behaviour I have added or modified has been documented in the User Guide in doc/cprover-manual/
• [ X ] Regression or unit tests are included, or existing tests cover the modified code (in this case I have detailed which ones those are in the commit message).
• [ X ] My commit message includes data points confirming performance improvements (if claimed).
• [ X ] My PR is restricted to a single feature or bugfix.
• [ X ] White-space or formatting changes outside the feature-related changed lines are in commits of their own.

[codecov]

Codecov Report

Merging #5697 (9926a8f) into develop (e8c09d3) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop    #5697   +/-   ##
========================================
  Coverage    69.50%   69.50%           
========================================
  Files         1243     1243           
  Lines       100674   100674           
========================================
  Hits         69977    69977           
  Misses       30697    30697           

Flag	Coverage Δ
cproversmt2	43.14% <ø> (ø)
regression	66.40% <ø> (ø)
unit	32.25% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/goto-cc/hybrid_binary.cpp	69.23% <ø> (ø)

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