VSTs are unreliable with MSVC builds

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Install nightly (msvc) on Windows 11, try to load [Synth1](https://daichilab.sakura.ne.jp/softsynth/index.html) plugin.
* Some machines can load Synth1
* Some machines can only load 64-bit Synth1
* Some machines can't load Synth1 at all (neither 32-bit nor 64-bit)

Quoting https://github.com/LMMS/lmms/pull/7987#issuecomment-3224871025:

| OS | Build | Synth1 (32-bit) | Synth1 (64-bit) |
|------|----|-----------------|-----------------|
| Windows 11 x64 (vm) | 567dbb1 (msvc) | 🚫 FAIL | 🚫 FAIL |
| **Windows 11 x64 (bare metal)** | 567dbb1 (msvc) | 🚫 FAIL | ✅ **PASS** |

Parent: #3999
Adjacent issues: #7976 #7987

Start by reproducing the failure with the MSVC nightly on Windows 11 and the Synth1 plugin, checking both 32-bit and 64-bit cases on different machines. Compare the results with the adjacent issues and parent issue; done when the cause is identified and Synth1 loads reliably across the reported configurations.

Written by the indexing model from the issue text.