Fix for rxd reaction compilation in windows.

[adamjhn]

I think anaconda modifies PATH so the compiler tried to use the wrong version of a library when building rxd reactions in windows.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 68.31%. Comparing base (cf1fde0) to head (09557a7).

Files with missing lines	Patch %	Lines
share/lib/python/neuron/rxd/rxd.py	50.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3735      +/-   ##
==========================================
- Coverage   68.31%   68.31%   -0.01%     
==========================================
  Files         689      689              
  Lines      111034   111036       +2     
==========================================
+ Hits        75848    75849       +1     
- Misses      35186    35187       +1     

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[github-actions]

✔️ 09557a7 -> artifacts URL

[ramcdougal]

Gemini makes a reasonably compelling argument that we shouldn't change globals to achieve a temporary effect, and suggests this pattern instead:

import os
import subprocess
import copy

# 1. Create a copy of the current environment so you don't pollute the global one
new_env = os.environ.copy()

# 2. Update the copy
new_paths = [
    os.path.join(h.neuronhome(), "mingw", "mingw64", "bin"),
    os.path.join(h.neuronhome(), "bin"),
    new_env.get("PATH", "")
]
new_env["PATH"] = os.pathsep.join(new_paths)

# 3. Run the command using this specific environment
# This leaves os.environ untouched, so there is no need to "restore" anything
result = subprocess.run(["your_command"], env=new_env)
rflag = result.returncode